Organic light-emitting device

ABSTRACT

An organic light-emitting device that includes a first electrode, a second electrode facing the first electrode, an emission layer between the first electrode and the second electrode, and a hole transport region between the first electrode and the emission layer is presented. The emission layer includes a first compound represented by Formula 1, and the hole transport region includes a second compound represented by Formula 2:

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. patentapplication Ser. No. 15/341,223 filed on Nov. 2, 2016, which claims thebenefit of Korean Patent Application No. 10-2016-0042410 filed on Apr.6, 2016 in the Korean Intellectual Property Office, the disclosure ofwhich is incorporated herein in its entirety by reference.

BACKGROUND 1. Field

One or more embodiments relate to an organic light-emitting device.

2. Description of the Related Art

Organic light-emitting devices are self-emission devices that have wideviewing angles, high contrast ratios, short response times, andexcellent brightness, driving voltage, and response speedcharacteristics, compared to devices in the art.

An organic light-emitting device may include a first electrode disposedon a substrate, and a hole transport region, an emission layer, anelectron transport region, and a second electrode, which aresequentially disposed on the first electrode. Holes provided from thefirst electrode may move toward the emission layer through the holetransport region, and electrons provided from the second electrode maymove toward the emission layer through the electron transport region.Carriers, such as holes and electrons, recombine in the emission layerto produce excitons. These excitons transition from an excited state toa ground state, thereby generating light.

SUMMARY

An aspect of embodiments of the present disclosure relates to an organiclight-emitting device having a low driving voltage and high efficiency.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

According to one or more embodiments, an organic light-emitting deviceincludes: a first electrode; a second electrode facing the firstelectrode; an emission layer between the first electrode and the secondelectrode; and a hole transport region between the first electrode andthe emission layer, wherein the emission layer includes a first compoundrepresented by Formula 1 below, and the hole transport region includes asecond compound represented by Formula 2:

In Formulae 1, 1-1, and 2, rings A₁, A₄, and A₁₁ may each independentlybe selected from a C₅-C₆₀ carbocyclic group and a C₁-C₃₀ heterocyclicgroup, ring A₂ may be selected from a C₁₀-C₆₀ carbocyclic group and aC₁-C₃₀ heterocyclic group, ring A₃ may be selected from a grouprepresented by Formula 1-1, X₁ may be selected from N andC-[(L₁)_(a1)-(R₁)_(b1)], X₂ may be selected from N andC-[(L₂)_(a2)-(R₂)_(b2)], and X₃ may be selected from N andC-[(L₃)_(a3)-(R₃)_(b3)], wherein at least one selected from X₁ to X₃ maybe N, X₁₁ may be selected from N-[(L₁₁)_(a11)-(R₁₁)_(b11)], O, S, Se,C(R₁₂)(R₁₃), and Si(R₁₂)(R₁₃), X₃₁ may be selected fromN-[(L₃₁)_(a31)-(R₃₁)_(b31)], O, S, Se, C(R₃₂)(R₃₃), and Si(R₃₂)(R₃₃);each of L₁ to L₆, L₁₁, L₂₁ to L₂₃, L₃₁, L₃₂, L₄₁, L₄₂, and L₅₁ mayindependently be selected from a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group; each of a1 to a6, a11,a21 to a23, a31, a32, a41, a42, and a51 may independently be an integerselected from 0 to 5; each of R₁ to R₅, R₁₂, R₁₃, R₂₁ to R₂₃, R₃₂ toR₃₅, R₅₁, and R₅₂ may independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —Si(Q₁)(Q₂)(Q₃), —N(Q₁)(Q₂), —B(Q₁)(Q₂),—C(═O)(Q₁), —S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂),

R₁ and R₄ may optionally be linked to form a saturated or unsaturatedring, R₂ and R₄ may optionally be linked to form a saturated orunsaturated ring, R₃ and R₅ may optionally be linked to form a saturatedor unsaturated ring, and R₁ and R₅ may optionally be linked to form asaturated or unsaturated ring; R₁₁, R₃₁, R₄₁, and R₄₂ may eachindependently be selected from a substituted or unsubstituted C₁-C₆₀alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, asubstituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted orunsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group; each of b1 to b5, b21 tob23, b34, b35, b51, and b52 may independently be an integer selectedfrom 0 to 5; each of b11, b31, b41, and b42 may independently be aninteger selected from 1 to 5; each of n1 to n3 and n12 may independentlybe an integer selected from 0 to 4; and n11 may be an integer selectedfrom 2 to 4; wherein at least one of substituents of the substitutedC₃-C₁₀ cycloalkylene group, substituted C₁-C₁₀ heterocycloalkylenegroup, substituted C₃-C₁₀ cycloalkenylene group, substituted C₁-C₁₀heterocycloalkenylene group, substituted C₆-C₆₀ arylene group,substituted C₁-C₆₀ heteroarylene group, a substituted divalentnon-aromatic condensed polycyclic group, a substituted divalentnon-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀ alkylgroup, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀ alkynylgroup, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkylgroup, substituted C₁-C₁₀ heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group, andsubstituted monovalent non-aromatic condensed heteropolycyclic group maybe selected from:

deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₆₀alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and aC₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amidino group, a hydrazino group, a hydrazono group, aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁),—S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂),

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃),—N(Q₂₁)(Q₂₂), —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and—P(═O)(Q₂₁)(Q₂₂); and

—Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),—S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₁ to Q₃, Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may eachindependently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryl group substituted with a C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl groupsubstituted with a C₆-C₆₀ aryl group, a terphenyl group, a C₁-C₆₀heteroaryl group, a C₁-C₆₀ heteroaryl group substituted with a C₁-C₆₀alkyl group, a C₁-C₆₀ heteroaryl group substituted with a C₆-C₆₀ arylgroup, a monovalent non-aromatic condensed polycyclic group, and amonovalent non-aromatic condensed heteropolycyclic group.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the accompanying drawings in which:

FIG. 1 shows a schematic view of an organic light-emitting deviceaccording to an embodiment of the present disclosure;

FIG. 2 shows a schematic view of an organic light-emitting deviceaccording to an embodiment of the present disclosure;

FIG. 3 shows a schematic view of an organic light-emitting deviceaccording to an embodiment of the present disclosure; and

FIG. 4 shows a schematic view of an organic light-emitting deviceaccording to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments, examples of whichare illustrated in the accompanying drawings, wherein like referencenumerals refer to like elements throughout. In this regard, the presentembodiments may have different forms and should not be construed asbeing limited to the descriptions set forth herein. Accordingly, theembodiments are merely described below, by referring to the figures, toexplain aspects of the present description. As used herein, the term“and/or” includes any and all combinations of one or more of theassociated listed items. Expressions such as “at least one of,” whenpreceding a list of elements, modify the entire list of elements and donot modify the individual elements of the list.

An organic light-emitting device according to an embodiment of thepresent disclosure includes a first electrode, a second electrode facingthe first electrode, an emission layer between the first electrode andthe second electrode, and a hole transport region between the firstelectrode and the emission layer, wherein the emission layer includes afirst compound, and the hole transport region includes a secondcompound.

The first electrode may be an anode, and the second electrode may be acathode, wherein the first electrode and the second electrode will bedescribed in detail later.

The first compound may be represented by Formula 1, and the secondcompound may be represented by Formula 2:

In Formula 1, rings A₂, A₃, and A₄ are condensed with each other, andeach of rings A₁ and A₂ is fused to a corresponding neighboring5-membered ring while having a covalent bond with a carbon atom or anitrogen atom.

Rings A₁ and A₄ in Formula 1 may each independently be selected from aC₅-C₆₀ carbocyclic group and a C₁-C₃₀ heterocyclic group, ring A₂ may beselected from a C₁₀-C₆₀ carbocyclic group and a C₁-C₃₀ heterocyclicgroup, and ring A₃ may be selected from a group represented by Formula1-1:

X₁₁ in Formula 1-1 is the same as described below.

In one embodiment, ring A₁ and A₄ in Formula 1 may each independently beselected from a benzene group, a naphthalene group, an anthracene group,a phenanthrene group, a pyrene group, a chrysene group, a triphenylenegroup, an indene group, a fluorene group, a benzofluorene group, aspiro-bifluorene group, a pyridine group, a pyrazine group, a pyrimidinegroup, a pyridazine group, a pyrrole group, an imidazole group, aquinoline group, an isoquinoline group, a quinoxaline group, aquinazoline group, a triazine group, an indenopyrazine group, anindenopyridine group, a phenanthroline group, and a phenanthridinegroup.

In one or more embodiments, rings A₁ and A₄ in Formula 1 may eachindependently be selected from a benzene group, a naphthalene group, anda pyridine group. In one or more embodiments, rings A₁ and A₄ in Formula1 may be a benzene group, but embodiments of the present disclosure arenot limited thereto.

In one embodiment, ring A₂ in Formula 1 may be selected from anaphthalene group, a heptalene group, a phenalene group, a phenanthrenegroup, an anthracene group, a triphenylene group, a pyrene group, achrysene group, naphthacene group, a picene group, a perylene group, apentaphene group, a fluorene group, a benzofluorene group, aspiro-bifluorene group, a pyridine group, a pyrazine group, a pyrimidinegroup, a pyridazine group, a pyrrole group, an imidazole group, aquinoline group, an isoquinoline group, a quinoxaline group, aquinazoline group, a triazine group, an indenopyrazine group, anindenopyridine group, a phenanthroline group, and a phenanthridinegroup.

In one or more embodiments, ring A₂ in Formula 1 may be selected from anaphthalene group, a phenanthrene group, an anthracene group, atriphenylene group, a pyrene group, a chrysene group, a quinoline group,an isoquinoline group, a quinoxaline group, and a quinazoline group. Inone or more embodiments, ring A₂ in Formula 1 may be selected from anaphthalene group, a phenanthrene group, and an isoquinoline group, butembodiments of the present disclosure are not limited thereto.

In one embodiment, ring A₁₁ in Formula 2 may be selected from a benzenegroup, a naphthalene group, an anthracene group, a phenanthrene group, apyrene group, a chrysene group, a triphenylene group, an indene group, afluorene group, a benzofluorene group, a spiro-bifluorene group, apyridine group, a pyrazine group, a pyrimidine group, a pyridazinegroup, a pyrrole group, an imidazole group, a quinoline group, anisoquinoline group, a quinoxaline group, a quinazoline group, a triazinegroup, an indenopyrazine group, an indenopyridine group, aphenanthroline group, and a phenanthridine group.

In one or more embodiments, ring A₁₁ may be selected from a benzenegroup, a naphthalene group, an anthracene group, a phenanthrene group, apyrene group, a chrysene group, and a triphenylene group. In one or moreembodiments, ring A₁₁ may be a benzene group, but embodiments of thepresent disclosure are not limited thereto.

In Formula 1, X₁ may be selected from N and C-[(L₁)_(a1)-(R₁)_(b1)], X₂may be selected from N and C-[(L₂)_(a2)-(R₂)_(b2)], X₃ may be selectedfrom N and C-[(L₃)_(a3)-(R₃)_(b3)], wherein at least one selected fromX₁ to X₃ may be N. That is, the first compound may include anitrogen-containing heterocyclic group that includes *═N—*′ as aring-forming moiety.

In one embodiment,

in Formula 1,

i) X₁ may be N, X₂ may be C-[(L₂)_(a2)-(R₂)_(b2)], and X₃ may beC-[(L₃)_(a3)-(R₃)_(b3)];

ii) X₁ may be C-[(L₁)_(a1)-(R₁)_(b1)], X₂ may beC-[(L₂)_(a2)-(R₂)_(b2)], and X₃ may be N;

iii) X₁ may be C-[(L₁)_(a1)-(R₁)_(b1)], X₂ may be N, and X₃ may beC-[(L₃)_(a3)-(R₃)_(b3)]; or

iv) X₁ may be C-[(L₁)_(a1)-(R₁)_(b1)], X₂ may be N, and X₁₃ may be N.

Herein, L₁ to L₃, a1 to a3, R₁ to R₃, and b1 to b3 are the same asdescribed above.

X₁₁ in Formula 1-1 may be selected from N-[(L₁₁)_(a11)-(R₁₁)_(b11)], O,S, Se, C(R₁₂)(R₁₃), and Si(R₁₂)(R₁₃). Herein, L₁₁, a11, R₁₁ to R₁₃, andb11 are the same as described above.

In one embodiment, X₁₁ in Formula 1-1 may be O or S, but embodiments ofthe present disclosure are not limited thereto.

X₃₁ in Formula 2 may be selected from N-[(L₃₁)_(a31)-(R₃₁)_(b31)], O, S,Se, C(R₃₂)(R₃₃), and Si(R₃₂)(R₃₃). Herein, L₃₁, a31, R₃₁ to R₃₃, and b31are the same as described above.

In one embodiment, X₃₁ in Formula 2 may be selected fromN-[(L₃₁)_(a31)-(R₃₁)_(b31)], O, S, and C(R₃₂)(R₃₃), but embodiments ofthe present disclosure are not limited thereto.

L₁ to L₆, L₁₁, L₂₁ to L₂₃, L₃₁, L₃₂, L₄₁, L₄₂, and L₅₁ in Formulae 1,1-1, and 2 may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkylene group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group.

For example, L₁ to L₆, L₁₁ and L₂₁ to L₂₃ in Formulae 1 and 1-1 may eachindependently be selected from:

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, an indacenylene group, anacenaphthylene group, a fluorenylene group, a spiro-bifluorenylenegroup, spiro-benzofluorene-fluorenylene group, a benzofluorenylenegroup, a dibenzofluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a perylenylene group, a pentaphenylene group, a pyrrolylenegroup, a thiophenylene group, a furanylene group, a silolylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an indolylene group, an isoindolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, a benzofuranylene group,a benzothiophenylene group, a benzosilolylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a dibenzosilolylene group, acarbazolylene group, a benzocarbazolylene group, a dibenzocarbazolylenegroup, a thiadiazolylene group, an imidazopyridinylene group, animidazopyrimidinylene group, an oxazolopyridinylene group, athiazolopyridinylene group, a benzonaphthyridinylene group, anazafluorenylene group, an azaspiro-bifluorenylene group, anazacarbazolylene group, an azadibenzofuranylene group, anazadibenzothiophenylene group and an azadibenzosilolylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, an indacenylene group, anacenaphthylene group, a fluorenylene group, a spiro-bifluorenylenegroup, spiro-benzofluorene-fluorenylene group, a benzofluorenylenegroup, a dibenzofluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a perylenylene group, a pentaphenylene group, a pyrrolylenegroup, a thiophenylene group, a furanylene group, a silolylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an indolylene group, an isoindolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, a benzofuranylene group,a benzothiophenylene group, a benzosilolylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a dibenzosilolylene group, acarbazolylene group, a benzocarbazolylene group, a dibenzocarbazolylenegroup, a thiadiazolylene group, an imidazopyridinylene group, animidazopyrimidinylene group, an oxazolopyridinylene group, athiazolopyridinylene group, a benzonaphthyridinylene group, anazafluorenylene group, an azaspiro-bifluorenylene group, anazacarbazolylene group, an azadibenzofuranylene group, anazadibenzothiophenylene group, and an azadibenzosilolylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromaticcondensed polycyclic group, a monovalent non-aromatic condensedheteropolycyclic group, a biphenyl group, a terphenyl group,—Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),—S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂);

L₃₁, L₃₂, L₄₁, L₄₂, and L₅₁ in Formula 2 may each independently beselected from:

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, an indacenylene group, anacenaphthylene group, a fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, aperylenylene group, a pentaphenylene group, a pyrrolylene group, athiophenylene group, a furanylene group, a silolylene group, apyridinylene group, an indolylene group, an isoindolylene group, apurinylene group, a benzofuranylene group, a benzothiophenylene group, abenzosilolylene group, a dibenzofuranylene group, a dibenzothiophenylenegroup and dibenzosilolylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, an indacenylene group, anacenaphthylene group, a fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, aperylenylene group, a pentaphenylene group, a pyrrolylene group, athiophenylene group, a furanylene group, a silolylene group, apyridinylene group, an indolylene group, an isoindolylene group, apurinylene group, a benzofuranylene group, a benzothiophenylene group, abenzosilolylene group, a dibenzofuranylene group, a dibenzothiophenylenegroup, and dibenzosilolylene group, each substituted with at least oneselected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group,a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group,a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenylgroup, a pentaphenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, a silolyl group, a pyridinyl group, an indolyl group, anisoindolyl group, a purinyl group, a benzofuranyl group, abenzothiophenyl group, a benzosilolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃),—N(Q₃₁)(Q₃₂), and —B(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ may each independently be selected from:

a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a pyridinyl group, apyrimidinyl group, a pyrazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, and a quinazolinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, apyridinyl group, a pyrimidinyl group, a pyrazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, and a quinazolinylgroup, each substituted with at least one selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, and a phenyl group.

In one embodiment, L₁ to L₆, L₁₁ and L₂₁ to L₂₃ in Formulae 1 and 1-1may each independently be selected from a group represented by one ofFormulae 3-1 to 3-100, and

L₃₁, L₃₂, L₄₁, L₄₂, and L₅₁ in Formula 2 may each independently beselected from a group represented by one of Formulae 3-1 to 3-30:

In Formulae 3-1 to 3-100,

Y₁ may be O, S, C(Z₃)(Z₄), N(Z₅), or Si(Z₆)(Z₇),

Z₁ to Z₇ may each independently be selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, acycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenylgroup, a biphenyl group, a terphenyl group, a pentalenyl group, anindenyl group, a naphthyl group, an azulenyl group, a heptalenyl group,an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a picenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pentacenyl group, arubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group,a thiophenyl group, a furanyl group, a silolyl group, an imidazolylgroup, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, anoxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinylgroup, a pyrimidinyl group, a pyridazinyl group, an indolyl group, anisoindolyl group, an indazolyl group, a purinyl group, a quinolinylgroup, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinylgroup, a naphthyridinyl group, a quinoxalinyl group, a quinazolinylgroup, a cinnolinyl group, a phenanthridinyl group, an acridinyl group,a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, a benzosilolyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, adibenzosilolyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a thiadiazolyl group, an imidazopyridinylgroup, an imidazopyrimidinyl group, benzonaphthyridinyl group, anazafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolylgroup, an azadibenzofuranyl group, an azadibenzothiophenyl group, anazadibenzosilolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂),—C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ may each independently be selected from:

a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a pyridinyl group, apyrimidinyl group, a pyrazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, and a quinazolinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, apyridinyl group, a pyrimidinyl group, a pyrazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, and a quinazolinylgroup, each substituted with at least one selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, and a phenyl group,

d2 may be an integer selected from 0 to 2,

d3 may be an integer selected from 0 to 3,

d4 may be an integer selected from 0 to 4,

d5 may be an integer selected from 0 to 5,

d6 may be an integer selected from 0 to 6,

d8 may be an integer selected from 0 to 8, and

* and *′ each indicate a binding site to a neighboring atom.

In one or more embodiments, L₃₁, L₃₂, L₄₁, L₄₂, and L₅₁ in Formula 2 mayeach independently a group represented by one of Formulae 3-1 to 3-30,

Z₁ to Z₇ in Formulae 3-1 to 3-30 may each independently be selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenylenegroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, anaphthacenyl group, a picenyl group, a perylenyl group, a pentaphenylgroup, a hexacenyl group, a pentacenyl group, a rubicenyl group, acoronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenylgroup, a furanyl group, a silolyl group, an indolyl group, an isoindolylgroup, a benzofuranyl group, a benzothiophenyl group, a benzosilolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, adibenzosilolyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, and a pyridinyl group, but embodiments of thepresent disclosure are not limited thereto.

a1 to a6, a11, a21 to a23, a31, a32, a41, a42, and a51 in Formulae 1,1-1, and 2 may each independently be an integer selected from 0 to 5. a1refers to the number of L₁(s), and when a1 is 0, *-(L₁)_(a1)-*′indicates a single bond, and when a1 is 2 or more, 2 or more L₁ (s) maybe identical to or different from each other. a2 to a6, a11, a21 to a23,a31, a32, a41, a42, and a51 may be the same as described in connectionwith a1 and the structures represented by Formulae 1, 1-1, and 2.

In one embodiment, a1 to a6, a11, a21 to a23, a31, a32, a41, a42, anda51 in Formulae 1, 1-1, and 2 may each independently be 0, 1, 2 or 3(or, 0, 1 or 2), but embodiments of the present disclosure are notlimited thereto.

R₁ to R₅, R₁₂, R₁₃, R₂₁ to R₂₃, R₃₂ to R₃₅, R₅₁, and R₅₂ in Formulae 1,1-1, and 2 may each independently be selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamidino group, a hydrazino group, a hydrazono group, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁)(Q₂)(Q₃), —N(Q₁)(Q₂), —B(Q₁)(Q₂), —C(═O)(Q₁), —S(═O)₂(Q₁), and—P(═O)(Q₁)(Q₂),

R₁ and R₄ may optionally be linked to form a saturated or unsaturatedring, R₂ and R₄ may optionally be linked to form a saturated orunsaturated ring, R₃ and R₅ may optionally be linked to form a saturatedor unsaturated ring, and R₁ and R₅ may optionally be linked to form asaturated or unsaturated ring,

R₁₁, R₃₁, R₄₁, and R₄₂ may each independently be selected from asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group.

In one embodiment, R₁ to R₅, R₁₂, R₁₃, and R₂₁ to R₂₃ in Formulae 1 and1-1 may each independently be selected from:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, and ahydrazono group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-bifluorenyl group,spiro-benzofluorene-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anindolyl group, an isoindolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azaspiro-bifluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, and an azadibenzosilolyl group; and

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-bifluorenyl group,spiro-benzofluorene-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anindolyl group, an isoindolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azaspiro-bifluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, and an azadibenzosilolyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, a terphenyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

R₁₁ in Formula 1-1 may be selected from:

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-bifluorenyl group,spiro-benzofluorene-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anindolyl group, an isoindolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azaspiro-bifluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, and an azadibenzosilolyl group; and

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-bifluorenyl group,spiro-benzofluorene-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anindolyl group, an isoindolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azaspiro-bifluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, and an azadibenzosilolyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, a terphenyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ may each independently be selected from:

a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a pyridinyl group, apyrimidinyl group, a pyrazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, and a quinazolinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, apyridinyl group, a pyrimidinyl group, a pyrazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, and a quinazolinylgroup, each substituted with at least one selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, and a phenyl group.

In one or more embodiments, R₃₁, R₄₁, and R₄₂ in Formula 2 may eachindependently be selected from:

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a perylenyl group, a pentaphenyl group, a pyrrolylgroup, a thiophenyl group, a furanyl group, a silolyl group, a pyridinylgroup, an indolyl group, an isoindolyl group, a purinyl group, abenzofuranyl group, a benzothiophenyl group, a benzosilolyl group, adibenzofuranyl group, a dibenzothiophenyl group, and a dibenzosilolylgroup; and

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a perylenyl group, a pentaphenyl group, a pyrrolylgroup, a thiophenyl group, a furanyl group, a silolyl group, a pyridinylgroup, an indolyl group, an isoindolyl group, a purinyl group, abenzofuranyl group, a benzothiophenyl group, a benzosilolyl group, adibenzofuranyl group, a dibenzothiophenyl group, and a dibenzosilolylgroup, each substituted with at least one selected from deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, acycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenylgroup, a biphenyl group, a terphenyl group, a pentalenyl group, anindenyl group, a naphthyl group, an azulenyl group, an indacenyl group,an acenaphthyl group, a fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, a pyridinyl group, an indolyl group, an isoindolyl group, apurinyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, adibenzosilolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), and—B(Q₃₁)(Q₃₂), and

R₃₂ to R₃₅, R₅₁, and R₅₂ in Formula 2 may each independently be selectedfrom:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, and ahydrazono group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a perylenyl group, a pentaphenyl group, a pyrrolylgroup, a thiophenyl group, a furanyl group, a silolyl group, animidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolylgroup, an oxazolyl group, an isoxazolyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolylgroup, an isoindolyl group, an indazolyl group, a purinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azadibenzofuranyl group, anazadibenzothiophenyl group, and an azadibenzosilolyl group; and

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-bifluorenyl group,spiro-benzofluorene-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anindolyl group, an isoindolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azaspiro-bifluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, and an azadibenzosilolyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, a terphenyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁) and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ may each independently be selected from:

a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a pyridinyl group, apyrimidinyl group, a pyrazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, and a quinazolinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, apyridinyl group, a pyrimidinyl group, a pyrazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, and a quinazolinylgroup, each substituted with at least one selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, and a phenyl group.

In one or more embodiments, R₁ to R₅, R₁₂, R₁₃, and R₂₁ to R₂₃ inFormulae 1 and 1-1 may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a group represented by one ofFormulae 5-1 to 5-45 and 6-1 to 6-124, —Si(Q₁)(Q₂)(Q₃), —S(═O)₂(Q₁), and—P(═O)(Q₁)(Q₂),

R₁₁ in Formulae 1 and 1-1 may be selected from a group represented byone of Formula 5-1 to 5-45 and 6-1 to 6-124,

R₃₁, R₄₁, and R₄₂ in Formula 2 may each independently be selected from agroup represented by one of Formulae 5-1 to 5-45, and

R₃₂ to R₃₅, R₅₁, and R₅₂ in Formula 2 may each independently be selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a group representedby one of Formulae 5-1 to 5-45, —Si(Q₁)(Q₂)(Q₃), —S(═O)₂(Q₁), and—P(═O)(Q₁)(Q₂):

In Formulae 5-1 to 5-45 and 6-1 to 6-124,

Y₃₁ and Y₃₂ may each independently be O, S, C(Z₃₃)(Z₃₄), N(Z₃₅), orSi(Z₃₆)(Z₃₇),

Y₄₁ may be N or C(Z₄₁), Y₄₂ may be N or C(Z₄₂), Y₄₃ may be N or C(Z₄₃),Y₄₄ may be N or C(Z₄₄), Y₅₁ may be N or C(Z₅₁), Y₅₂ may be N or C(Z₅₂),Y₅₃ may be N or C(Z₅₃), Y₅₄ may be N or C(Z₅₄), at least one selectedfrom Y₄₁ to Y₄₃ and Y₅₁ to Y₅₄ in Formula 6-118 to 6-121 may be N, atleast one selected from Y₄₁ to Y₄₄ and Y₅₁ to Y₅₄ in Formulae 5-122 maybe N, and

Z₃₁ to Z₃₇, Z₄₁ to Z₄₄, and Z₅₁ to Z₅₄ may each independently beselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, ahydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenylgroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, anaphthacenyl group, a picenyl group, a perylenyl group, a pentaphenylgroup, a hexacenyl group, a pentacenyl group, a rubicenyl group, acoronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenylgroup, a furanyl group, a silolyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, apyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolylgroup, an indazolyl group, a purinyl group, a quinolinyl group, anisoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, anaphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, acinnolinyl group, a phenanthridinyl group, an acridinyl group, aphenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, a benzosilolyl group, anisobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group,a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, adibenzosilolyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a thiadiazolyl group, an imidazopyridinylgroup, an imidazopyrimidinyl group, benzonaphthyridinyl group, anazafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolylgroup, an azadibenzofuranyl group, an azadibenzothiophenyl group, anazadibenzosilolyl group, and —Si(Q₃₁)(Q₃₂)(Q₃₃),

wherein Q₁ to Q₃ and Q₃₁ to Q₃₃ may each independently be selected from:

a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a pyridinyl group, apyrimidinyl group, a pyrazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, and a quinazolinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, apyridinyl group, a pyrimidinyl group, a pyrazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, and a quinazolinylgroup, each substituted with at least one selected from a C₁-C₁₀ alkylgroup, a C₁-C₁₀ alkoxy group, and a phenyl group,

e2 may be an integer selected from 0 to 2,

e3 may be an integer selected from 0 to 3,

e4 may be an integer selected from 0 to 4,

e5 may be an integer selected from 0 to 5,

e6 may be an integer selected from 0 to 6,

e7 may be an integer selected from 0 to 7,

e9 may be an integer selected from 0 to 9, and

* indicates a binding site to a neighboring atom.

For example, R₃₁, R₄₁, and R₄₂ in Formula 2 may each independently be agroup represented by one of Formulae 5-1 to 5-45,

Z₃₁ to Z₃₇ in Formulae 5-1 to 5-45 may each independently be selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, abiphenyl group, a terphenyl group, a pentalenyl group, an indenyl group,a naphthyl group, an azulenyl group, a heptalenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenylenegroup, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, anaphthacenyl group, a picenyl group, a perylenyl group, a pentaphenylgroup, a hexacenyl group, a pentacenyl group, a rubicenyl group, acoronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenylgroup, a furanyl group, a silolyl group, an indolyl group, an isoindolylgroup, a benzofuranyl group, a benzothiophenyl group, a benzosilolylgroup, a dibenzofuranyl group, a dibenzothiophenyl group, adibenzosilolyl group, a carbazolyl group, a benzocarbazolyl group, adibenzocarbazolyl group, and a pyridinyl group.

In one embodiment,

R₁ to R₅, R₁₂, R₁₃, and R₂₁ to R₂₃ in Formulae 1 and 1-1 may eachindependently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a group represented by one of Formulae 9-1 to 9-100, agroup represented by one of Formulae 10-1 to 10-121, —Si(Q₁)(Q₂)(Q₃),—S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂) (wherein Q₁ to Q₃ are the same asdescribed above),

R₁₁ in Formula 1-1 may be selected from a group represented by one ofFormulae 9-1 to 9-100 and 10-1 to 10-121,

R₃₁, R₄₁, and R₄₂ in Formula 2 may each independently be selected from agroup represented by one of Formulae 9-1 to 9-100, and

R₃₂ to R₃₅, R₅₁, and R₅₂ in Formula 2 may each independently be selectedfrom hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a group representedby one of Formulae 9-1 to 9-100, —Si(Q₁)(Q₂)(Q₃), —S(═O)₂(Q₁), and—P(═O)(Q₁)(Q₂) (wherein Q₁ to Q₃ are the same as described above), butembodiments of the present disclosure are not limited thereto:

In Formulae 9-1 to 9-100 and 10-1 to 10-121, Ph refers to a phenylgroup, and * indicates a binding site to a neighboring atom.

In one embodiment, R₁ to R₅, R₁₂, R₁₃, and R₂₁ to R₂₃ in Formulae 1 and1-1 may each independently be hydrogen, deuterium, a cyano group, aC₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a group represented by one ofFormulae 9-1 to 9-100, or a group represented by one of Formulae 10-1 to10-121, and R₁₁ in Formula 1-1 may be a group represented by one ofFormulae 9-1 to 9-100 or a group represented by one of Formulae 10-1 to10-121.

In one embodiment, R₃₁, R₄₁, and R₄₂ in Formula 2 may each independentlybe a group represented by one of Formulae 9-1 to 9-100, and R₃₂ to R₃₅,R₅₁, and R₅₂ in Formula 2 may each independently be selected fromhydrogen, deuterium, a cyano group, a C₁-C₁₀ alkyl group, a C₁-C₁₀alkoxy group, or a group represented by one of Formulae 9-1 to 9-100,but embodiments of the present disclosure are not limited thereto.

In Formulae 1, 1-1, and 2,

b1 to b5, b21 to b23, b34, b35, b51, and b52 may each independently bean integer selected from 0 to 5 (for example, 0, 1, or 2),

b11, b31, b41, and b42 may each independently be an integer selectedfrom 1 to 5 (for example, 1 or 2),

n1 to n3 and n12 may each independently be an integer selected from 0 to4 (for example, 0 or 1), and

n11 may be an integer selected from 2 to 4 (for example, 2 or 3).

In Formula 1, b1 refers to the number of R₁(s), and when b1 is two ormore, two or more R₁(s) may be identical to or different from eachother. b2 to b5, b11, b21 to b23, b31, b34, b35, b41, b42, b51, and b52are the same as described in connection with b1 and Formulae 1, 1-1, and2.

n1 in Formula 1 refers to the number of *-[(L₂₁)_(a21)-(R₂₁)_(b21)](s),and when n1 is two or more, two or more *-[(L₂₁)_(a21)-(R₂₁)_(b21)](s)may be identical to or different from each other. n2, n3, n11, and n12are the same as described in connection with n1 and Formulae 1 and 2.

In one embodiment,

in Formula 1 may be a group represented by one of Formulae A-1 to A-3,B-1 to B-3, and C-1 to C-4:

R₄ and R₅ in Formulae A-1 to A-3, B-1 to B-3, and C-1 to C-4 are thesame as described above.

For example, R₄ and R₅ in Formulae A-1 to A-3, B-1 to B-3, and C-1 toC-4 may be each independently be selected from:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group,and a pyridinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group,and a pyridinyl group, each substituted with at least one selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, and a pyridinyl group.

* refers to a binding site to N or (L₆)_(a6) in Formula 1.

In one embodiment, the first compound may be represented by one ofFormulae 1A to 1L:

rings A₁ and A₄, X₁ to X₃, X₁₁, L₆, a6, R₄, R₅, R₂₁ to R₂₃, and b21 tob23 in

Formulae 1A to 1L are the same as described above.

For example, in Formulae 1A to 1L,

rings A₁ and A₄ may each be a benzene group,

i) X₁ may be N, X₂ may be C-[(L₂)_(a2)-(R₂)_(b2)], and X₃ may beC-[(L₃)_(a3)-(R₃)_(b3)];

ii) X₁ may be C-[(L₁)_(a1)-(R₁)_(b1)], X₂ may beC-[(L₂)_(a2)-(R₂)_(b2)], and X₃ may be N;

iii) X₁ may be C-[(L₁)_(a1)-(R₁)_(b1)], X₂ may be N, and X₃ may beC-[(L₃)_(a3)-(R₃)_(b3)]; or

iv) X₁ may be C-[(L₁)_(a1)-(R₁)_(b1)], X₂ may be N, and X₃ may be N,

X₁₁ may be O or S,

L₁ to L₃ and L₆ may each independently be a group represented by one ofFormulae 3-1 to 3-100,

a1 to a3 may each independently be 0, 1, or 2,

R₁ to R₅ and R₂₁ to R₂₃ may each independently be selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a group represented by one ofFormulae 5-1 to 5-45 and 6-1 to 6-124, —Si(Q₁)(Q₂)(Q₃), —S(═O)₂(Q₁), and—P(═O)(Q₁)(Q₂) (Q₁ to Q₃ are the same as described above), and

b1 to b3 and b21 to b23 may each independently be 0, 1, or 2.

In one or more embodiments, the second compound may be represented byone of Formulae 2A to 2D:

In Formulae 2A to 2D, X₃₁, L₃₂, a32, R₃₄, R₃₅, b34, and b35 are the sameas described above,

L_(41a) and L_(41b) are the same as described in connection with L₄₁,

L_(42a) and L_(42b) are the same as described in connection with L₄₂,

aa41 and ab41 are the same as described in connection with a41,

aa42 and ab42 are the same as described in connection with a42,

R_(41a) and R_(41b) are the same as described in connection with R₄₁,

R_(42a) and R_(42b) are the same as described in connection with R₄₂,

ba41 and bb41 are the same as described in connection with b41, and

ba42 and bb42 are the same as described in connection with b42.

For example, in Formulae 2A to 2D,

X₃₁ may be selected from N-[(L₃₁)_(a31)-(R₃₁)_(b31)], O, S, andC(R₃₂)(R₃₃),

L₃₁, L₃₂, L_(41a), L_(41b), L_(42a), and L_(42b) may each independentlyselected from a group represented by one of Formulae 3-1 to 3-30,

a31, a32, aa41, ab41, aa42, and ab42 may each independently be 0, 1, or2,

R₃₄ and R₃₅ may each independently be selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a group represented by one of Formulae 5-1to 5-45, —Si(Q₁)(Q₂)(Q₃), —S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂) (where Q₁ toQ₃ are the same as described above),

R_(41a), R_(41b), R_(42a), and R_(42b) may each independently beselected from a group represented by one of Formulae 5-1 to 5-45,

ba41, bb41, ba42, and bb42 may each independently be 1 or 2.

In one embodiment, the first compound may be selected from Compounds 1-1to 1-24, and the second compound may be selected from Compounds 2-1 to2-27:

Due to the inclusion of the first compound and the second compound, theorganic light-emitting device may have low driving voltage and highefficiency.

In one embodiment, the emission layer may include the first compound.

In one embodiment, the emission layer may include a host and a dopant,and the host may include the first compound. The host may furtherinclude, in addition to the first compound, a host that is known in theart.

In one or more embodiments, the hole transport region may include thesecond compound.

For example, the hole transport region may include a hole injectionlayer, a hole transport layer, and an emission auxiliary layer, theemission auxiliary layer may directly contact the emission layer, andthe emission auxiliary layer may include the second compound, butembodiments of the present disclosure are not limited thereto.

[Description of FIG. 1]

FIG. 1 is a schematic view of an organic light-emitting device 10according to an embodiment. The organic light-emitting device 10includes a first electrode 110, an organic layer 150, and a secondelectrode 190.

Hereinafter, the structure of the organic light-emitting device 10according to an embodiment and a method of manufacturing the organiclight-emitting device 10 will be described in connection with FIG. 1.

[First Electrode 110]

In FIG. 1, a substrate may be additionally disposed under the firstelectrode 110 or above the second electrode 190. The substrate may be aglass substrate or a plastic substrate, each having excellent mechanicalstrength, thermal stability, transparency, surface smoothness, ease ofhandling, and water-resistance.

The first electrode 110 may be formed by depositing or sputtering amaterial for forming the first electrode 110 on the substrate. When thefirst electrode 110 is an anode, the material for forming a firstelectrode may be selected from materials with a high work function tofacilitate hole injection.

The first electrode 110 may be a reflective electrode, asemi-transmissive electrode, or a transmissive electrode. When the firstelectrode 110 is a transmissible electrode, a material for forming afirst electrode may be selected from indium tin oxide (ITO), indium zincoxide (IZO), tin oxide (SnO₂), zinc oxide (ZnO), and any combinationsthereof, but is not limited thereto. When the first electrode 110 is asemi-transmissive electrode or a reflective electrode, as a material forforming the first electrode 110, magnesium (Mg), silver (Ag), aluminum(Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In),magnesium-silver (Mg—Ag), or any combination thereof may be used.However, the material for forming the first electrode 110 is not limitedthereto.

The first electrode 110 may have a single-layered structure, or amulti-layered structure including two or more layers. For example, thefirst electrode 110 may have a three-layered structure of ITO/Ag/ITO,but the structure of the first electrode 110 is not limited thereto.

[Organic Layer 150]

The organic layer 150 is disposed on the first electrode 110. Theorganic layer 150 may include an emission layer.

The organic layer 150 may include a hole transport region between thefirst electrode 110 and the emission layer, and an electron transportregion between the emission layer and the second electrode 190.

[Hole Transport Region in Organic Layer 150]

The hole transport region may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The hole transport region may include at least one layer selected from ahole injection layer (HIL), a hole transport layer (HTL), an emissionauxiliary layer, and an electron blocking layer (EBL).

For example, the hole transport region may have a single-layeredstructure including a single layer including a plurality of differentmaterials, or a multi-layered structure having a structure of holeinjection layer/hole transport layer, hole injection layer/holetransport layer/emission auxiliary layer, hole injection layer/emissionauxiliary layer, hole transport layer/emission auxiliary layer or holeinjection layer/hole transport layer/electron blocking layer, whereinfor each structure, constituting layers are sequentially stacked fromthe first electrode 110 in this stated order, but the structure of thehole transport region is not limited thereto.

In one embodiment, the hole transport region may include an emissionauxiliary layer, the emission auxiliary layer may directly contact theemission layer, and the emission auxiliary layer may include the secondcompound.

The hole transport region may further include, in addition to the secondcompound, at least one selected from m-MTDATA, TDATA, 2-TNATA, NPB(NPD),13-NPB, TPD, Spiro-TPD, Spiro-NPB, methylated-NPB, TAPC, HMTPD,4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA),polyaniline/dodecylbenzenesulfonic acid (Pani/DBSA), PEDOT/PSS(poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate)),polyaniline/camphor sulfonic acid (Pani/CSA),polyaniline/poly(4-styrenesulfonate) (Pani/PSS), a compound representedby Formula 201, and a compound represented by Formula 202, butembodiments of the present disclosure are not limited thereto:

In Formulae 201 and 202,

L₂₀₁ to L₂₀₄ may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkylene group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group,

L₂₀₅ may be selected from *—O—*′, *—S—*I, *—N(Q₂₀₁)-*′, a substituted orunsubstituted C₁-C₂₀ alkylene group, a substituted or unsubstitutedC₂-C₂₀ alkenylene group, a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group,

xa1 to xa4 may each independently an integer selected from 0 to 3,

xa5 may be an integer selected from 1 to 10, and

R₂₀₁ to R₂₀₄ and Q₂₀₁ may each independently be selected from asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted orunsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, and a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group.

For example, in Formula 202, R₂₀₁ and R₂₀₂ may optionally be linked viaa single bond, a dimethyl-methylene group, or a diphenyl-methylenegroup, and R₂₀₃ and R₂₀₄ may optionally be linked via a single bond, adimethyl-methylene group, or a diphenyl-methylene group.

In one embodiment, L₂₀₁ to L₂₀₅ in Formulae 201 and 202 may eachindependently be selected from:

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, athiophenylene group, a furanylene group, a carbazolylene group, anindolylene group, an isoindolylene group, a benzofuranylene group, abenzothiophenylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a dibenzosilolylene group, and apyridinylene group; and

a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, a heptalenylene group, anindacenylene group, an acenaphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, anaphthacenylene group, a picenylene group, a perylenylene group, apentaphenylene group, a hexacenylene group, a pentacenylene group, arubicenylene group, a coronenylene group, an ovalenylene group, athiophenylene group, a furanylene group, a carbazolylene group, anindolylene group, an isoindolylene group, a benzofuranylene group, abenzothiophenylene group, a dibenzofuranylene group, adibenzothiophenylene group, a benzocarbazolylene group, adibenzocarbazolylene group, a dibenzosilolylene group, and apyridinylene group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, and a naphthyl group.

In one or more embodiments, xa1 to xa4 may each independently be 0, 1,or 2.

In one or more embodiments, xa5 may be 1, 2, 3, or 4.

In one or more embodiments, R₂₀₁ to R₂₀₄ and Q₂₀₁ may each independentlybe selected from a phenyl group, a biphenyl group, a terphenyl group, apentalenyl group, an indenyl group, a naphthyl group, an azulenyl group,a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, a heptalenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenalenyl group, a phenanthrenyl group, an anthracenyl group,a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a naphthacenyl group, a picenyl group, a perylenylgroup, a pentaphenyl group, a hexacenyl group, a pentacenyl group, arubicenyl group, a coronenyl group, an ovalenyl group, a thiophenylgroup, a furanyl group, a carbazolyl group, an indolyl group, anisoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ are the same as described above.

In one or more embodiments, at least one selected from R₂₀₁ to R₂₀₃Formula 201 may each independently be selected from:

a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group; and

a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amidino group, a hydrazinogroup, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a phenyl group substituted with a C₁-C₁₀ alkylgroup, a phenyl group substituted with —F, a naphthyl group, a fluorenylgroup, a spiro-bifluorenyl group, a carbazolyl group, a dibenzofuranylgroup, and a dibenzothiophenyl group, but embodiments of the presentdisclosure are not limited thereto.

In one or more embodiments, in Formula 202, i) R₂₀₁ and R₂₀₂ may belinked via a single bond, and/or ii) R₂₀₃ and R₂₀₄ may be linked via asingle bond.

In one or more embodiments, at least one selected from R₂₀₁ to R₂₀₄ inFormula 202 may be selected from:

a carbazolyl group; and

a carbazolyl group, substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, acarbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,but embodiments of the present disclosure are not limited thereto.

The compound represented by Formula 201 may be represented by Formula201A:

For example, the compound represented by Formula 201 may be representedby Formula 201A(1), but embodiments of the present disclosure are notlimited thereto:

In one embodiment, the compound represented by Formula 201 may berepresented by Formula 201A-1, but embodiments of the present disclosureare not limited thereto:

The compound represented by Formula 202 may be represented by Formula202A:

In one or more embodiments, the compound represented by Formula 202 maybe represented by Formula 202A-1:

In Formulae 201A, 201A(1), 201A-1, 202A, and 202A-1,

L₂₀₁ to L₂₀₃, xa1 to xa3, and R₂₀₂ to R₂₀₄ are the same as describedabove,

R₂₁₁ and R₂₁₂ are the same as described in connection with R₂₀₃,

R₂₁₃ to R₂₁₇ may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a phenyl groupsubstituted with a C₁-C₁₀ alkyl group, a phenyl group substituted with—F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, athiophenyl group, a furanyl group, a carbazolyl group, an indolyl group,an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, a dibenzosilolyl group, and apyridinyl group.

The hole transport region may include at least one compound selectedfrom Compounds HT1 to HT39, but embodiments of the present disclosureare not limited thereto:

A thickness of the hole transport region may be in a range of about 100Å to about 10,000 Å, for example, about 100 Å to about 1,000 Å. When thehole transport region includes at least one of a hole injection layerand a hole transport layer, the thickness of the hole injection layermay be in a range of about 100 Å to about 9,000 Å, and for example,about 100 Å to about 1,000 Å and the thickness of the hole transportlayer may be in a range of about 50 Å to about 2,000 Å and for example,about 100 Å to about 1,500 Å When the thicknesses of the hole transportregion, the hole injection layer and the hole transport layer are withinthese ranges, satisfactory hole transporting characteristics may beobtained without a substantial increase in driving voltage.

The emission auxiliary layer may increase light-emission efficiency bycompensating for an optical resonance distance according to thewavelength of light emitted by an emission layer, and the electronblocking layer may block the flow of electrons from an electrontransport region. The emission auxiliary layer and the electron blockinglayer may include the materials as described above.

[p-Dopant]

The hole transport region may further include, in addition to thesematerials, a charge-generation material for the improvement ofconductive properties. The charge-generation material may behomogeneously or non-homogeneously dispersed in the hole transportregion.

The charge-generation material may be, for example, a p-dopant.

In one embodiment, a lowest unoccupied molecular orbital (LUMO) of thep-dopant may be −3.5 eV or less.

The p-dopant may include at least one selected from a quinonederivative, a metal oxide, and a cyano group-containing compound, butembodiments are not limited thereto.

For example, the p-dopant may include at least one selected from:

a quinone derivative, such as tetracyanoquinodimethane (TCNQ) and2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ),

a metal oxide, such as tungsten oxide or molybdenum oxide;

1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN), and

a compound represented by Formula 221,

but is not limited thereto:

In Formula 221,

R₂₂₁ to R₂₂₃ may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, asubstituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group, provided that at leastone selected from R₂₂₁ to R₂₂₃ has at least one substituent selectedfrom a cyano group, —F, —Cl, —Br, —I, a C₁-C₂₀ alkyl group substitutedwith —F, a C₁-C₂₀ alkyl group substituted with —Cl, a C₁-C₂₀ alkyl groupsubstituted with Br, and a C₁-C₂₀ alkyl group substituted with —I.

[Emission Layer in Organic Layer 150]

When the organic light-emitting device 10 is a full color organiclight-emitting device, the emission layer may be patterned into a redemission layer, a green emission layer, or a blue emission layer,according to a sub pixel. In one or more embodiments, the emission layermay have a stacked structure of two or more layers selected from a redemission layer, a green emission layer, and a blue emission layer, inwhich the two or more layers contact each other or are separated fromeach other. In one or more embodiments, the emission layer may includetwo or more materials selected from a red-light emission material, agreen-light emission material, and a blue-light emission material, inwhich the two or more materials are mixed with each other in a singlelayer to emit white light.

In one embodiment, the emission layer of the organic light-emittingdevice 10 may be a first-color-light emission layer,

the organic light-emitting device 10 may further include i) at least onesecond-color-light emission layer or ii) at least one second-color-lightemission layer and at least one third-color-light emission layer,between the first electrode 110 and the second electrode 190,

a maximum emission wavelength of the first-color-light emission layer, amaximum emission wavelength of the second-color-light emission layer,and a maximum emission wavelength of the third-color-light emissionlayer are identical to or different from each other, and

The organic light-emitting device 10 may emit mixed light includingfirst-color-light and second-color-light, or mixed light includingfirst-color-light, second-color-light, and third-color-light, butembodiments are not limited thereto.

For example, the maximum emission wavelength of the first-color-lightemission layer is different from a maximum emission wavelength of thesecond-color-light emission layer, and the mixed light includingfirst-color-light and second-color-light may be white light, butembodiments are not limited thereto.

In one or more embodiments, the maximum emission wavelength of thefirst-color-light emission layer, the maximum emission wavelength of thesecond-color-light emission layer, and the maximum emission wavelengthof the third-color-light emission layer may be different from oneanother, and the mixed light including first-color-light,second-color-light, and third-color-light may be white light. However,embodiments are not limited thereto.

The emission layer may include a host and a dopant. The dopant mayinclude at least one selected from a phosphorescent dopant and afluorescent dopant.

An amount of the dopant in the emission layer may be, in general, in arange of about 0.01 to about 15 parts by weight based on 100 parts byweight of the host, but is not limited thereto.

A thickness of the emission layer may be in a range of about 100 Å toabout 1,000 Å, for example, about 200 Å to about 600 Å. When thethickness of the emission layer is within this range, excellentlight-emission characteristics may be obtained without a substantialincrease in driving voltage.

[Host in Emission Layer]

The host may include the first compound.

In one or more embodiments, the host may include a compound representedby Formula 301 below.

[Ar₃₀₁]_(xb11)-[(L₃₀₁)_(xb1)-R₃₀₁]_(xb21)  <Formula 301>

In Formula 301,

-   -   Ar₃₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic        group or    -   a substituted or unsubstituted C₁-C₆₀ heterocyclic group,

xb11 may be 1, 2, or 3; and

L₃₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group;

xb1 may be an integer selected from 0 to 5,

R₃₀₁ may be selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,a cyano group, a nitro group, an amidino group, a hydrazino group, ahydrazono group, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkylgroup, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —Si(Q₃₀₁)(Q₃₀₂)(Q₃₀₃), —N(Q₃₀₁)(Q₃₀₂),—B(Q₃₀₁)(Q₃₀₂), —C(═O)(Q₃₀₁), —S(═O)₂(Q₃₀₁), and —P(═O)(Q₃₀₁)(Q₃₀₂), and

xb21 may be an integer selected from 1 to 5,

wherein Q₃₀₁ to Q₃₀₃ may each independently be selected from a C₁-C₁₀alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, and a naphthyl group, but embodiments of the presentdisclosure are not limited thereto.

In one embodiment, Ar₃₀₁ in Formula 301 may be selected from:

a naphthalene group, a fluorene group, a spiro-bifluorene group, abenzofluorene group, a dibenzofluorene group, a phenalene group, aphenanthrene group, an anthracene group, a fluoranthene group, atriphenylene group, a pyrene group, a chrysene group, naphthacene group,a picene group, a perylene group, a pentaphene group, anindenoanthracene group, a dibenzofuran group, and a dibenzothiophenegroup; and

a naphthalene group, a fluorene group, a spiro-bifluorene group, abenzofluorene group, a dibenzofluorene group, a phenalene group, aphenanthrene group, an anthracene group, a fluoranthene group, atriphenylene group, a pyrene group, a chrysene group, naphthacene group,a picene group, a perylene group, a pentaphene group, anindenoanthracene group, a dibenzofuran group, and a dibenzothiophenegroup, each substituted with at least one selected from deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂),—C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, and a naphthyl group, but embodiments of the presentdisclosure are not limited thereto.

When xb11 in Formula 301 is two or more, two or more Ar₃₀₁(s) may belinked via a single bond.

In one or more embodiments, the compound represented by Formula 301 maybe represented by Formula 301-1 or 301-2:

In Formulae 301-1 to 301-2,

-   -   A₃₀₁ to A₃₀₄ may each independently be selected from a benzene,        a naphthalene, a phenanthrene, a fluoranthene, a triphenylene, a        pyrene, a chrysene, a pyridine, a pyrimidine, an indene, a        fluorene, a spiro-bifluorene, a benzofluorene, a        dibenzofluorene, an indole, a carbazole, benzocarbazole,        dibenzocarbazole, a furan, a benzofuran, a dibenzofuran, a        naphthofuran, a benzonaphthofuran, a dinaphthofuran, a        thiophene, a benzothiophene, a dibenzothiophene, a        naphthothiophene, a benzonaphthothiophene, and a        dinaphthothiophene,

X₃₀₁ may be O, S, or N-[(L₃₀₄)_(xb4)-R₃₀₄],

R₃₁₁ to R₃₁₄ may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

xb22 and xb23 may each independently be 0, 1, or 2,

L₃₀₁, xb1, R₃₀₁, and Q₃₁ to Q₃₃ are the same as described above,

L₃₀₂ to L₃₀₄ are each independently the same as described in connectionwith L₃₀₁,

xb2 to xb4 are each independently the same as described in connectionwith xb1, and

R₃₀₂ to R₃₀₄ are each independently the same as described in connectionwith R₃₀₁.

For example, in Formulae 301, 301-1, and 301-2, L₃₀₁ to L₃₀₄ may eachindependently be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a perylenylene group, a pentaphenylenegroup, a hexacenylene group, a pentacenylene group, a thiophenylenegroup, a furanylene group, a carbazolylene group, an indolylene group,an isoindolylene group, a benzofuranylene group, a benzothiophenylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, abenzocarbazolylene group, a dibenzocarbazolylene group, adibenzosilolylene group, a pyridinylene group, an imidazolylene group, apyrazolylene group, a thiazolylene group, an isothiazolylene group, anoxazolylene group, an isoxazolylene group, a thiadiazolylene group, anoxadiazolylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, a triazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, an isobenzothiazolylenegroup, a benzoxazolylene group, an isobenzoxazolylene group, atriazolylene group, a tetrazolylene group, an imidazopyridinylene group,an imidazopyrimidinylene group, and an azacarbazolylene group; and

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a perylenylene group, a pentaphenylenegroup, a hexacenylene group, a pentacenylene group, a thiophenylenegroup, a furanylene group, a carbazolylene group, an indolylene group,an isoindolylene group, a benzofuranylene group, a benzothiophenylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, abenzocarbazolylene group, a dibenzocarbazolylene group, adibenzosilolylene group, a pyridinylene group, an imidazolylene group, apyrazolylene group, a thiazolylene group, an isothiazolylene group, anoxazolylene group, an isoxazolylene group, a thiadiazolylene group, anoxadiazolylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, a triazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, an isobenzothiazolylenegroup, a benzoxazolylene group, an isobenzoxazolylene group, atriazolylene group, a tetrazolylene group, an imidazopyridinylene group,an imidazopyrimidinylene group, and an azacarbazolylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a hexacenyl group, a pentacenyl group, a thiophenyl group, afuranyl group, a carbazolyl group, an indolyl group, an isoindolylgroup, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranylgroup, a dibenzothiophenyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, animidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolylgroup, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, anoxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, abenzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinylgroup, an azacarbazolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ are the same as described above.

In one embodiment, R₃₀₁ to R₃₀₄ in Formulae 301, 301-1, and 301-2 mayeach independently be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group and anazacarbazolyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and anazacarbazolyl group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, aperylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a thiophenyl group, a furanyl group, a carbazolyl group, anindolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, an azacarbazolylgroup, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),—S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ are the same as described above.

In one embodiment, the host may include an alkaline-earth metal complex.For example, the host may be selected from a Be complex (for example,Compound H55), a Mg complex, and a Zn complex.

The host may include at least one selected from9,10-di(2-naphthyl)anthracene (ADN),2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN),9,10-di-(2-naphthyl)-2-t-butyl-anthracene (TBADN), a4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP), 1,3-di-9-carbazolylbenzene(mCP), 1,3,5-tri(carbazol-9-yl)benzene (TCP), and Compounds H1 to H55,but is not limited thereto:

[Phosphorescent Dopant in Emission Layer in Organic Layer 150]

The phosphorescent dopant may include an organometallic compoundincluding iridium (Ir), platinum (Pt), palladium (Pd), osmium (Os),titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium(Tb), rhodium (Rh), or thulium (Tm).

In one embodiment, the phosphorescent dopant may include anorganometallic compound represented by Formula 401:

In Formulae 401 and 402,

M may be selected from iridium(Ir), platinum(Pt), palladium(Pd),osmium(Os), titanium(Ti), zirconium(Zr), hafnium(Hf), europium(Eu),terbium(Tb), rhodium(Rh), and thulium(Tm),

L₄₀₁ may be a ligand represented by Formula 402, and xc1 may be 1, 2, or3, and when xc1 is two or more, two or more L₄₀₁ (s) may be identical toor different from each other,

L₄₀₂ may be an organic ligand, and xc2 may be an integer selected from 0to 4, and when xc2 is two or more, two or more L₄₀₂ (s) may be identicalto or different from each other,

X₄₀₁ to X₄₀₄ may each independently be nitrogen or carbon,

X₄₀₁ and X₄₀₃ may be linked via a single bond or a double bond, and X₄₀₂and X₄₀₄ may be linked via a single bond or a double bond,

A₄₀₁ and A₄₀₂ may each independently be a C₅-C₆₀ carbocyclic group or aC₁-C₆₀ heterocyclic group,

X₄₀₅ may be a single bond, *—O—*′, *—S—*′, *—C(═O)—*′, *—N(Q₄₁₁)-*′,*—C(Q₄₁₁)(Q₄₁₂)-*′, *—C(Q₄₁₁)═C(Q₄₁₂)-*′, *—C(Q₄₁₁)=*′, or *═C(Q₄₁₁)=*′,Q₄₁₁ and Q₄₁₂ may be hydrogen, deuterium, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or anaphthyl group,

X₄₀₆ may be a single bond, O, or S,

R₄₀₁ and R₄₀₂ may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, asubstituted or unsubstituted C₁-C₂₀ alkyl group, a substituted orunsubstituted C₁-C₂₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group —Si(Q₄₀₁)(Q₄₀₂)(Q₄₀₃),—N(Q₄₀₁)(Q₄₀₂), —B(Q₄₀₁)(Q₄₀₂), —C(═O)(Q₄₀₁), —S(═O)₂(Q₄₀₁), and—P(═O)(Q₀₁)(Q₄₀₂), wherein Q₄₀₁ to Q₄₀₃ may each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a C₆-C₂₀ aryl group,and a C₁-C₂₀ heteroaryl group,

xc11 and xc12 may each independently be an integer selected from 0 to10,

* and *′ in Formula 402 each indicate a binding site to M in Formula401.

In one embodiment, A₄₀₁ and A₄₀₂ in Formula 402 may each independentlybe selected from a benzene group, a naphthalene group, a fluorene group,a spiro-bifluorene group, an indene group, a pyrrole group, a thiophenegroup, a furan group, an imidazole group, a pyrazole group, a thiazolegroup, an isothiazole group, an oxazole group, an isoxazole group, apyridine group, a pyrazine group, a pyrimidine group, a pyridazinegroup, a quinoline group, an isoquinoline group, a benzoquinoline group,a quinoxaline group, a quinazoline group, a carbazole group, abenzimidazole group, a benzofuran group, a benzothiophene group, anisobenzothiophene group, a benzoxazole group, an isobenzoxazole group, atriazole group, a tetrazole group, an oxadiazole group, a triazinegroup, a dibenzofuran group, and a dibenzothiophene group.

In one or more embodiments, in Formula 402, i) X₄₀₁ may be nitrogen,X₄₀₂ may be carbon, or ii) X₄₀₁ and X₄₀₂ may all be nitrogen.

In one or more embodiments, R₄₀₁ and R₄₀₂ in Formula 402 may eachindependently be selected from:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, ahydrazono group, a phenyl group, a naphthyl group, a cyclopentyl group,a cyclohexyl group, an adamantanyl group, a norbornanyl group, and anorbornenyl group;

a cyclopentyl group, a cyclohexyl group, an adamantanyl group, anorbornanyl group, a norbornenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a fluorenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group;

a cyclopentyl group, a cyclohexyl group, an adamantanyl group, anorbornanyl group, a norbornenyl group a phenyl group, a biphenyl group,a terphenyl group, a naphthyl group, a fluorenyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, atriazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amidino group, a hydrazinogroup, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, acyclopentyl group, a cyclohexyl group, an adamantanyl group, anorbornanyl group, a norbornenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a naphthyl group, a fluorenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, adibenzofuranyl group, and a dibenzothiophenyl group; and

—Si(Q₄₀₁)(Q₄₀₂)(Q₄₀₃), —N(Q₄₀₁)(Q₄₀₂), —B(Q₄₀₁)(Q₄₀₂), —C(═O)(Q₄₀₁),—S(═O)₂(Q₄₀₁), and —P(═O)(Q₄₀₁)(Q₄₀₂),

wherein Q₄₀₁ to Q₄₀₃ may each independently be selected from a C₁-C₁₀alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group,and a naphthyl group, but embodiments of the present disclosure are notlimited thereto.

In one or more embodiments, in Formula 401, when xc1 is two or more, intwo or two or more L₄₀₁ (s), two A₄₀₁ (s) may optionally be linked via alinking group X₄₀₇, or two A₄₀₂(s) may optionally be linked via alinking group X₄₀₈ (see Compounds PD1 to PD4 and PD7). X₄₀₇ and X₄₀₈ mayeach independently be a single bond, *—O—*′, *—S—*I, *—C(═O)—*′,*—N(Q₄₁₃)-*′, *—C(Q₄₁₃)(Q₄₁₄)-*′, or *—C(Q₄₁₃)═C(Q₄₁₄)-*′ (wherein Q₄₁₃and Q₄₁₄ may each independently be hydrogen, deuterium, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, or a naphthyl group), but embodiments of the presentdisclosure are not limited thereto.

L₄₀₂ in Formula 401 may be a monovalent, divalent, or trivalent organicligand. For example, L₄₀₂ may be selected from halogen, diketone (forexample, acetylacetonate), carboxylic acid (for example, picolinate),—C(═O), isonitrile, —CN, and phosphorus (for example, phosphine, orphosphite), but is not limited thereto.

In one or more embodiments, the phosphorescent dopant may be selectedfrom, for example, Compounds PD1 to PD25, but is not limited thereto:

[Fluorescent Dopant in Emission Layer]

The fluorescent dopant may include an arylamine compound or astyrylamine compound.

In one or more embodiments, the fluorescent dopant may include acompound represented by Formula 501.

In Formula 501,

Ar₅₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic group ora substituted or unsubstituted C₁-C₆₀ heterocyclic group,

L₅₀₁ to L₅₀₃ may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkylene group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group,

xd1 to xd3 may each independently be an integer of 0 to 3;

R₅₀₁ and R₅₀₂ may each independently be selected from a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, and a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,

xd4 may be an integer of 1 to 6.

In one embodiment, Ar₅₀₁ in Formula 501 may be selected from:

a naphthalene group, a heptalene group, a fluorene group, aspiro-bifluorene group, a benzofluorene group, a dibenzofluorene group,a phenalene group, a phenanthrene group, an anthracene group, afluoranthene group, a triphenylene group, a pyrene group, a chrysenegroup, a naphthacene group, a picene group, a perylene group, apentaphene group, an indenoanthracene group, and an indenophenanthrenegroup; and

a naphthalene group, a heptalene group, a fluorene group, aspiro-bifluorene group, a benzofluorene group, a dibenzofluorene group,a phenalene group, a phenanthrene group, an anthracene group, afluoranthene group, a triphenylene group, a pyrene group, a chrysenegroup, a naphthacene group, a picene group, a perylene group, apentaphene group, an indenoanthracene group, and an indenophenanthrenegroup, each substituted with at least one selected from deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, and a naphthyl group.

In one or more embodiments, L₅₀₁ to L₅₀₃ in Formula 501 may eachindependently be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a perylenylene group, a pentaphenylenegroup, a hexacenylene group, a pentacenylene group, a thiophenylenegroup, a furanylene group, a carbazolylene group, an indolylene group,an isoindolylene group, a benzofuranylene group, a benzothiophenylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, abenzocarbazolylene group, a dibenzocarbazolylene group,dibenzosilolylene group, and a pyridinylene group; and

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a perylenylene group, a pentaphenylenegroup, a hexacenylene group, a pentacenylene group, a thiophenylenegroup, a furanylene group, a carbazolylene group, an indolylene group,an isoindolylene group, a benzofuranylene group, a benzothiophenylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, abenzocarbazolylene group, a dibenzocarbazolylene group,dibenzosilolylene group, and a pyridinylene group, each substituted withat least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amidino group, a hydrazinogroup, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, and a pyridinyl group.

In one or more embodiments, R₅₀₁ and R₅₀₁ in Formula 502 may eachindependently be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, and a pyridinyl group; and

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, and a pyridinyl group, each substituted with atleast one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, ahydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenylgroup, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, and —Si(Q₃₁)(Q₃₂)(Q₃₃),

wherein Q₃₁ to Q₃₃ may each be selected from a C₁-C₁₀ alkyl group, aC₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, and a naphthyl group.

In one or more embodiments, xd4 in Formula 501 may be 2, but is notlimited thereto.

For example, the fluorescent dopant may be selected from Compounds FD1to FD22:

In one or more embodiments, the fluorescent dopant may be selected fromthe following compounds, but is not limited thereto.

[Electron Transport Region in Organic Layer 150]

The electron transport region may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The electron transport region may include at least one selected from abuffer layer, a hole blocking layer, an electron control layer, anelectron transport layer, and an electron injection layer, but is notlimited thereto.

For example, the electron transport region may have a structure ofelectron transport layer/electron injection layer, a structure of holeblocking layer/electron transport layer/electron injection layer, astructure of electron control layer/electron transport layer/electroninjection layer, or a structure of buffer layer/electron transportlayer/electron injection layer, wherein the layers of these structuresare sequentially stacked in these stated orders on an emission layer.However, embodiments of the structure of the electron transport regionare not limited thereto.

The electron transport region (for example, a buffer layer, a holeblocking layer, an electron control layer, or an electron transportlayer in the electron transport region) may include a metal-freecompound containing at least one π electron-depleted nitrogen-containingring.

The “π electron-depleted nitrogen-containing ring” indicates a C₁-C₆₀heterocyclic group having at least one *—N=*′ moiety as a ring-formingmoiety.

For example, the “π electron-depleted nitrogen-containing ring” may bei) a 60-membered to 7-membered hetero monocyclic group having at leastone *—N=*′ moiety, ii) a heteropoly cyclic group in which two or more5-membered to 7-membered hetero monocyclic groups each having at leastone *—N=*′ moiety are condensed with each other, or iii) a heteropolycyclic group in which at least one of 5-membered to 7-membered heteromonocyclic groups, each having at least one *—N=*′ moiety, is condensedwith at least one C₅-C₆₀ carbocyclic group.

Examples of the π electron-depleted nitrogen-containing ring include animidazole, a pyrazole, a thiazole, an isothiazole, an oxazole, anisoxazole, a pyridine, a pyrazine, a pyrimidine, a pyridazine, anindazole, a purine, a quinoline, an isoquinoline, a benzoquinoline, aphthalazine, a naphthyridine, a quinoxaline, a quinazoline, a cinnoline,a phenanthridine, an acridine, a phenanthroline, a phenazine, abenzimidazole, an isobenzothiazole, a benzoxazole, an isobenzoxazole, atriazole, a tetrazole, an oxadiazole, a triazine, thiadiazol, animidazopyridine, an imidazopyrimidine, and an azacarbazole, but are notlimited thereto.

For example, the electron transport region may include a compoundrepresented by Formula 601:

[Ar₆₀₁]_(xe11)-[(L₆₀₁)_(xe1)-R₆₀₁]_(xe21)  <Formula 601>

In Formula 601,

Ar₆₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic group ora substituted or unsubstituted C₁-C₆₀ heterocyclic group,

xe11 may be 1, 2, or 3,

L₆₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group;

xe1 may be an integer selected from 0 to 5,

R₆₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group, a substituted or unsubstituted monovalent non-aromaticcondensed heteropolycyclic group, —Si(Q₆₀₁)(Q₆₀₂)(Q₆₀₃), —C(═O)(Q₆₀₁),—S(═O)₂(Q₆₀₁), and —P(═O)(Q₆₀₁)(Q₆₀₂),

Q₆₀₁ to Q₆₀₃ may each independently be a C₁-C₁₀ alkyl group, a C₁-C₁₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or anaphthyl group, and

xe21 may be an integer selected from 1 to 5.

In one embodiment, at least one of Ar₆₀₁(s) in the number of xe11 and/orat least one of R₆₀₁(s) in the number of xe21 may include the πelectron-depleted nitrogen-containing ring.

In one embodiment, ring Ar₆₀₁ in Formula 601 may be selected from:

a benzene group, a naphthalene group, a fluorene group, aspiro-bifluorene group, a benzofluorene group, a dibenzofluorene group,a phenalene group, a phenanthrene group, an anthracene group, afluoranthene group, a triphenylene group, a pyrene group, a chrysenegroup, naphthacene group, a picene group, a perylene group, a pentaphenegroup, an indenoanthracene group, a dibenzofuran group, adibenzothiophene group, a carbazole group, an imidazole group, apyrazole group, a thiazole group, an isothiazole group, an oxazolegroup, an isoxazole group, a pyridine group, a pyrazine group, apyrimidine group, a pyridazine group, an indazole group, a purine group,a quinoline group, an isoquinoline group, a benzoquinoline group, aphthalazine group, naphthyridine group, a quinoxaline group, aquinazoline group, a cinnoline group, a phenanthridine group, anacridine group, a phenanthroline group, a phenazine group, abenzimidazole group, an isobenzothiazole group, a benzoxazole group, anisobenzoxazole group, a triazole group, a tetrazole group, an oxadiazolegroup, a triazine group, thiadiazol group, an imidazopyridine group, animidazopyrimidine group, and an azacarbazole group; and

a benzene group, a naphthalene group, a fluorene group, aspiro-bifluorene group, a benzofluorene group, a dibenzofluorene group,a phenalene group, a phenanthrene group, an anthracene group, afluoranthene group, a triphenylene group, a pyrene group, a chrysenegroup, naphthacene group, a picene group, a perylene group, a pentaphenegroup, an indenoanthracene group, a dibenzofuran group, adibenzothiophene group, a carbazole group, an imidazole group, apyrazole group, a thiazole group, an isothiazole group, an oxazolegroup, an isoxazole group, a pyridine group, a pyrazine group, apyrimidine group, a pyridazine group, an indazole group, a purine group,a quinoline group, an isoquinoline group, a benzoquinoline group, aphthalazine group, naphthyridine group, a quinoxaline group, aquinazoline group, a cinnoline group, a phenanthridine group, anacridine group, a phenanthroline group, a phenazine group, abenzimidazole group, an isobenzothiazole group, a benzoxazole group, anisobenzoxazole group, a triazole group, a tetrazole group, an oxadiazolegroup, a triazine group, thiadiazol group, an imidazopyridine group, animidazopyrimidine group, and an azacarbazole group, each substitutedwith at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxylgroup, a cyano group, a nitro group, an amidino group, a hydrazinogroup, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group,—Si(Q₃₁)(Q₃₂)(Q₃₃), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, and a naphthyl group.

When xe11 in Formula 601 is two or more, two or more Ar₆₀₁(s) may belinked via a single bond.

In one or more embodiments, Ar₆₀₁ in Formula 601 may be an anthracenegroup.

In one or more embodiments, the compound represented by Formula 601 maybe represented by Formula 601-1:

In Formula 601-1,

X₆₁₄ may be N or C(R₆₁₄), X₆₁₅ may be N or C(R₆₁₅), X₆₁₆ may be N orC(R₆₁₆), at least one selected from X₆₁₄ to X₆₁₆ may be N,

L₆₁₁ to L₆₁₃ may each independently be the same as described inconnection with L₆₀₁,

xe611 to xe613 may each independently be the same as described inconnection with xe1,

R₆₁₁ to R₆₁₃ may each independently be the same as described inconnection with R₆₀₁,

R₆₁₄ to R₆₁₆ may each independently be selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, and a naphthyl group.

In one embodiment, L₆₀₁ and L₆₁₁ to L₆₁₃ in Formulae 601 and 601-1 mayeach independently be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a perylenylene group, a pentaphenylenegroup, a hexacenylene group, a pentacenylene group, a thiophenylenegroup, a furanylene group, a carbazolylene group, an indolylene group,an isoindolylene group, a benzofuranylene group, a benzothiophenylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, abenzocarbazolylene group, a dibenzocarbazolylene group, adibenzosilolylene group, a pyridinylene group, an imidazolylene group, apyrazolylene group, a thiazolylene group, an isothiazolylene group, anoxazolylene group, an isoxazolylene group, a thiadiazolylene group, anoxadiazolylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, a triazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, an isobenzothiazolylenegroup, a benzoxazolylene group, an isobenzoxazolylene group, atriazolylene group, a tetrazolylene group, an imidazopyridinylene group,an imidazopyrimidinylene group, and an azacarbazolylene group; and

a phenylene group, a naphthylene group, a fluorenylene group, aspiro-bifluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenanthrenylene group, an anthracenylenegroup, a fluoranthenylene group, a triphenylenylene group, a pyrenylenegroup, a chrysenylene group, a perylenylene group, a pentaphenylenegroup, a hexacenylene group, a pentacenylene group, a thiophenylenegroup, a furanylene group, a carbazolylene group, an indolylene group,an isoindolylene group, a benzofuranylene group, a benzothiophenylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, abenzocarbazolylene group, a dibenzocarbazolylene group, adibenzosilolylene group, a pyridinylene group, an imidazolylene group, apyrazolylene group, a thiazolylene group, an isothiazolylene group, anoxazolylene group, an isoxazolylene group, a thiadiazolylene group, anoxadiazolylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, a triazinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, an isobenzothiazolylenegroup, a benzoxazolylene group, an isobenzoxazolylene group, atriazolylene group, a tetrazolylene group, an imidazopyridinylene group,an imidazopyrimidinylene group, and an azacarbazolylene group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group,an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a hexacenyl group, a pentacenyl group, a thiophenyl group, afuranyl group, a carbazolyl group, an indolyl group, an isoindolylgroup, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranylgroup, a dibenzothiophenyl group, a benzocarbazolyl group, adibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, animidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolylgroup, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, anoxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a triazinyl group, a quinolinyl group, an isoquinolinyl group, abenzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, abenzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl groupand an azacarbazolyl group, but embodiments of the present disclosureare not limited thereto.

In one or more embodiments, xe1 and xe611 to xe613 in Formulae 601 and601-1 may each independently be 0, 1, or 2.

In one or more embodiments, R₆₀₁ and R₆₁₁ to R₆₁₃ in Formulae 601 and601-1 may each independently be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and anazacarbazolyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, afluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenylgroup, a perylenyl group, a pentaphenyl group, a hexacenyl group, apentacenyl group, a thiophenyl group, a furanyl group, a carbazolylgroup, an indolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and anazacarbazolyl group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a fluorenyl group, aspiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, aperylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a thiophenyl group, a furanyl group, a carbazolyl group, anindolyl group, an isoindolyl group, a benzofuranyl group, abenzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a benzocarbazolyl group, a dibenzocarbazolyl group, adibenzosilolyl group, a pyridinyl group, an imidazolyl group, apyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolylgroup, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group,a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinylgroup, a quinolinyl group, an isoquinolinyl group, a benzoquinolinylgroup, a phthalazinyl group, a naphthyridinyl group, a quinoxalinylgroup, a quinazolinyl group, a cinnolinyl group, a phenanthridinylgroup, an acridinyl group, a phenanthrolinyl group, a phenazinyl group,a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolylgroup, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, and anazacarbazolyl group; and

—S(═O)₂(Q₆₀₁) and —P(═O)(Q₆₀₁)(Q₆₀₂),

wherein Q₆₀₁ and Q₆₀₂ are the same as described above.

The electron transport region may include at least one compound selectedfrom Compounds ET1 to ET36, but embodiments of the present disclosureare not limited thereto:

In one or more embodiments, the electron transport region may include atleast one compound selected from2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP),4,7-diphenyl-1,10-phenanthroline (Bphen), Alq₃, BAlq,3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole(TAZ), and NTAZ.

Thicknesses of the buffer layer, the hole blocking layer, and theelectron control layer may each be in a range of about 20 Å to about1,000 Å, for example, about 30 Å to about 300 Å. When the thicknesses ofthe buffer layer, the hole blocking layer, and the electron controllayer are within these ranges, the electron blocking layer may haveexcellent electron blocking characteristics or electron controlcharacteristics without a substantial increase in driving voltage.

A thickness of the electron transport layer may be in a range of about100 Å to about 1,000 Å, for example, about 150 Å to about 500 Å. Whenthe thickness of the electron transport layer is within the rangedescribed above, the electron transport layer may have satisfactoryelectron transport characteristics without a substantial increase indriving voltage.

The electron transport region (for example, the electron transport layerin the electron transport region) may further include, in addition tothe materials described above, a metal-containing material.

The metal-containing material may include at least one selected fromalkali metal complex and alkaline earth-metal complex. The alkali metalcomplex may include a metal ion selected from an Li ion, a Na ion, a Kion, a Rb ion, and a Cs ion, and the alkaline earth-metal complex mayinclude a metal ion selected from a Be ion, a Mg ion, a Ca ion, an Srion, and a Ba ion. A ligand coordinated with the metal ion of the alkalimetal complex or the alkaline earth-metal complex may be selected from ahydroxy quinoline, a hydroxy isoquinoline, a hydroxy benzoquinoline, ahydroxy acridine, a hydroxy phenanthridine, a hydroxy phenylan oxazole,a hydroxy phenylthiazole, a hydroxy diphenylan oxadiazole, a hydroxydiphenylthiadiazol, a hydroxy phenylpyridine, a hydroxyphenylbenzimidazole, a hydroxy phenylbenzothiazole, a bipyridine, aphenanthroline, and a cyclopentadiene, but is not limited thereto.

For example, the metal-containing material may include a Li complex. TheLi complex may include, for example, Compound ET-D1 (lithium quinolate,LiQ) or ET-D2.

The electron transport region may include an electron injection layerthat facilitates injection of electrons from the second electrode 190.The electron injection layer may directly contact the second electrode190.

The electron injection layer may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The electron injection layer may include at least one selected fromalkali metal, alkaline earth-metal, rare-earth metal, alkali metalcompound, alkaline earth-metal compound, rare-earth metal compound,alkali metal complex, alkaline earth metal complex, and rare-earth metalcomplex.

The alkali metal may be selected from Li, Na, K, Rb, and Cs. In oneembodiment, the alkali metal may be Li, Na, or Cs. In variousembodiments, the alkali metal may be Li or Cs, but is not limitedthereto.

The alkaline earth metal may be selected from Mg, Ca, Sr, and Ba.

The rare-earth metal may be selected from Sc, Y, Ce, Yb, Gd, and Tb.

The alkali metal compound, the alkaline earth-metal compound, and therare-earth metal compound may be selected from oxides and halides (forexample, fluorides, chlorides, bromides, or iodines) of the alkalimetal, the alkaline earth-metal and rare-earth metal.

The alkali metal compound may be selected from alkali metal oxides, suchas Li₂O, Cs₂O, or K₂O, and alkali metal halides, such as LiF, NaF, CsF,KF, LiI, NaI, CsI, KI, or RbI. In one embodiment, the alkali metalcompound may be selected from LiF, Li₂O, NaF, LiI, NaI, CsI, and KI, butis not limited thereto.

The alkaline earth-metal compound may be selected from alkalineearth-metal compounds, such as BaO, SrO, CaO, Ba_(x)Sr_(1-x)O(0<x<1), orBa_(x)Ca_(1-x)xO(0<x<1). In one embodiment, the alkaline earth-metalcompound may be selected from BaO, SrO, and CaO, but is not limitedthereto.

The rare-earth metal compound may be selected from YbF₃, ScF₃, ScO₃,Y₂O₃, Ce₂O₃, GdF₃, and TbF₃. In one embodiment, the rare-earth metalcompound may be selected from YbF₃, ScF₃, TbF₃, Ybl₃, Scl₃, and Tbl₃,but is not limited thereto.

The alkali metal complex, the alkaline earth-metal complex, and therare-earth metal complex may include an ion of alkali metal, alkalineearth-metal, and rare-earth metal as described above, and a ligandcoordinated with a metal ion of the alkali metal complex, the alkalineearth-metal complex, and the rare-earth metal complex may eachindependently be selected from hydroxy quinoline, hydroxy isoquinoline,hydroxy benzoquinoline, hydroxy acridine, hydroxy phenanthridine,hydroxy phenylan oxazole, hydroxy phenylthiazole, hydroxy diphenylanoxadiazole, hydroxy diphenylthiadiazol, hydroxy phenylpyridine, hydroxyphenylbenzimidazole, hydroxy phenylbenzothiazole, bipyridine, and aphenanthroline and cyclopentadiene, but is not limited thereto.

The electron injection layer may consist of alkali metal, alkaline earthmetal, rare-earth metal, alkali metal compound, alkaline earth-metalcompound, rare-earth metal compound, alkali metal complex, alkalineearth-metal complex, rare-earth metal complex or any combinationsthereof, as described above. In various embodiments, the electroninjection layer may further include an organic material. When theelectron injection layer further includes an organic material, alkalimetal, alkaline earth metal, rare-earth metal, alkali metal compound,alkaline earth-metal compound, rare-earth metal compound, alkali metalcomplex, alkaline earth-metal complex, rare-earth metal complex, or anycombinations thereof may be homogeneously or non-homogeneously dispersedin a matrix including the organic material.

A thickness of the electron injection layer may be in a range of about 1Å to about 100 Å, for example, about 3 Å to about 90 Å. When thethickness of the electron injection layer is within the range describedabove, the electron injection layer may have satisfactory electroninjection characteristics without a substantial increase in drivingvoltage.

[Second Electrode 190]

The second electrode 190 may be disposed on the organic layer 150 havingsuch a structure. The second electrode 190 may be a cathode that is anelectron injection electrode, and in this regard, a material for formingthe second electrode 190 may be a material having a low work function,and such a material may be metal, alloy, an electrically conductivecompound, or a mixture thereof.

The second electrode 190 may include at least one selected from lithium(Li), silver (Si), magnesium (Mg), aluminum (Al), aluminum-lithium(Al—Li), calcium (Ca), magnesium-indium (Mg—In), magnesium-silver(Mg—Ag), ITO, and IZO, but is not limited thereto. The second electrode190 may be a transmissive electrode, a semi-transmissive electrode, or areflective electrode.

The second electrode 190 may have a single-layered structure, or amulti-layered structure including two or more layers.

[Description of FIGS. 2 to 4]

An organic light-emitting device 20 of FIG. 2 includes a first cappinglayer 210, a first electrode 110, an organic layer 150, and a secondelectrode 190 which are sequentially stacked in this stated order, anorganic light-emitting device 30 of FIG. 3 includes a first electrode110, an organic layer 150, a second electrode 190, and a second cappinglayer 220 which are sequentially stacked in this stated order, and anorganic light-emitting device 40 of FIG. 4 includes a first cappinglayer 210, a first electrode 110, an organic layer 150, a secondelectrode 190, and a second capping layer 220.

Regarding FIGS. 2 to 4, the first electrode 110, the organic layer 150,and the second electrode 190 may be understood by referring to thedescription presented in connection with FIG. 1.

In the organic layer 150 of each of the organic light-emitting devices20 and 40, light generated in an emission layer may pass through thefirst electrode 110, which is a semi-transmissive electrode or atransmissive electrode, and the first capping layer 210 toward theoutside, and in the organic layer 150 of each of the organiclight-emitting devices 30 and 40, light generated in an emission layermay pass through the second electrode 190, which is a semi-transmissiveelectrode or a transmissive electrode, and the second capping layer 220toward the outside.

The first capping layer 210 and the second capping layer 220 mayincrease external luminescent efficiency according to the principle ofconstructive interference.

The first capping layer 210 and the second capping layer 220 may eachindependently be an organic capping layer including an organic material,an inorganic capping layer including an inorganic material, or acomposite capping layer including an organic material and an inorganicmaterial.

At least one selected from the first capping layer 210 and the secondcapping layer 220 may each independently include at least one materialselected from carbocyclic compounds, heterocyclic compounds, amine-basedcompounds, porphyrine derivatives, phthalocyanine derivatives,naphthalocyanine derivatives, alkali metal complexes, and alkalineearth-based complexes. The carbocyclic compound, the heterocycliccompound, and the amine-based compound may be optionally substitutedwith a substituent containing at least one element selected from O, N,S, Se, Si, F, Cl, Br, and I. In one embodiment, at least one selectedfrom the first capping layer 210 and the second capping layer 220 mayeach independently include an amine-based compound.

In various embodiments, at least one selected from the first cappinglayer 210 and the second capping layer 220 may each independentlyinclude a compound selected from Compounds CP1 to CP5, but is notlimited thereto.

Hereinbefore, the organic light-emitting device according to anembodiment has been described in connection with FIGS. 1-4. However,embodiments are not limited thereto.

Layers constituting the hole transport region, an emission layer, andlayers constituting the electron transport region may be formed in acertain region by using one or more suitable methods selected fromvacuum deposition, spin coating, casting, langmuir-blodgett (LB)deposition, ink-jet printing, laser-printing, and laser-induced thermalimaging.

When the respective layers of the hole transport region, the emissionlayer, and the respective layers of the electron transport region areformed by deposition, the deposition may be performed at a depositiontemperature of about 100° C. to about 500° C., at a vacuum degree ofabout 10⁻⁸ to about 10⁻³ torr, and at a deposition rate of about 0.01 toabout 100 Å/sec depending on a material for forming a layer to bedeposited, and the structure of a layer to be formed.

When layers constituting the hole transport region, an emission layer,and layers constituting the electron transport region are formed by spincoating, the spin coating may be performed at a coating speed of about2,000 rpm to about 5,000 rpm and at a heat treatment temperature ofabout 80° C. to 200° C. depending on a material to be included in alayer and the structure of each layer to be formed.

[General Definition of Substituents]

The term “C₁-C₆₀ alkyl group” as used herein refers to a linear orbranched saturated aliphatic hydrocarbon monovalent group having 1 to 60carbon atoms, and non-limiting examples thereof include a methyl group,an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a pentyl group, an iso-amyl group, and a hexyl group.The term “C₁-C₆₀ alkylene group” as used herein refers to a divalentgroup having the same structure as the C₁-C₆₀ alkyl group.

The term “C₂-C₆₀ alkenyl group” as used herein refers to a hydrocarbongroup formed by substituting at least one carbon-carbon double bond inthe middle or at the terminus of the C₂-C₆₀ alkyl group, andnon-limiting examples thereof include an ethenyl group, a propenylgroup, and a butenyl group. The term “C₂-C₆₀ alkenylene group” as usedherein refers to a divalent group having the same structure as theC₂-C₆₀ alkenyl group.

The term “C₂-C₆₀ alkynyl group” as used herein refers to a hydrocarbongroup formed by substituting at least one carbon-carbon triple bond inthe middle or at the terminus of the C₂-C₆₀ alkyl group, andnon-limiting examples thereof include an ethynyl group, and a propynylgroup. The term “02-C₆₀ alkynylene group” as used herein refers to adivalent group having the same structure as the C₂-C₆₀ alkynyl group.

The term “C₁-C₆₀ alkoxy group” as used herein refers to a monovalentgroup represented by —OA₁₀₁ (wherein A₁₀₁ is the C₁-C₆₀ alkyl group),and non-limiting examples thereof include a methoxy group, an ethoxygroup, and an isopropyloxy group.

The term “C₃-C₁₀ cycloalkyl group” as used herein refers to a monovalentsaturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, andnon-limiting examples thereof include a cyclopropyl group, a cyclobutylgroup, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group.The term “C₃-C₁₀ cycloalkylene group” as used herein refers to adivalent group having the same structure as the C₃-C₁₀ cycloalkyl group.

The term “C₁₀-C₁₀ heterocycloalkyl group” as used herein refers to amonovalent saturated monocyclic group having at least one heteroatomselected from N, O, Si, P, and S as a ring-forming atom and 1 to 10carbon atoms, and non-limiting examples thereof include a1,2,3,4-oxatriazolidinyl group, a tetrahydrofuranyl group, and atetrahydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkylene group”as used herein refers to a divalent group having the same structure asthe C₁-C₁₀ heterocycloalkyl group.

The term “C₃-C₁₀ cycloalkenyl group” as used herein refers to amonovalent monocyclic group that has 3 to 10 carbon atoms and at leastone carbon-carbon double bond in the ring thereof and does not havearomaticity, and non-limiting examples thereof include a cyclopentenylgroup, a cyclohexenyl group, and a cycloheptenyl group. The term “C₃-C₁₀cycloalkenylene group” as used herein refers to a divalent group havingthe same structure as the C₃-C₁₀ cycloalkenyl group.

The term “C₁-C₁₀ heterocycloalkenyl group” as used herein refers to amonovalent monocyclic group that has at least one heteroatom selectedfrom N, O, Si, P, and S as a ring-forming atom, 1 to 10 carbon atoms,and at least one carbon-carbon double bond in its ring. Non-limitingexamples of the C₁-C₁₀ heterocycloalkenyl group include a4,5-dihydro-1,2,3,4-oxatriazolyl group, a 2,3-dihydrofuranyl group and a2,3-dihydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkenylenegroup” as used herein refers to a divalent group having the samestructure as the C₁-C₁₀ heterocycloalkenyl group.

The term “C₆-C₆₀ aryl group” as used herein refers to a monovalent grouphaving a carbocyclic aromatic system having 6 to 60 carbon atoms, andthe term “C₆-C₆₀ arylene group” as used herein refers to a divalentgroup having a carbocyclic aromatic system having 6 to 60 carbon atoms.Non-limiting examples of the C₆-C₆₀ aryl group include a phenyl group, anaphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenylgroup, and a chrysenyl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀arylene group each include two or more rings, the rings may be fused toeach other.

The term “C₁-C₆₀ heteroaryl group” as used herein refers to a monovalentgroup having a heterocyclic aromatic system that has at least oneheteroatom selected from N, O, Si, P, and S as a ring-forming atom, inaddition to 1 to 60 carbon atoms. The term “C₁-C₆₀ heteroarylene group”as used herein refers to a divalent group having a heterocyclic aromaticsystem that has at least one heteroatom selected from N, O, Si, P, and Sas a ring-forming atom, in addition to 1 to 60 carbon atoms.Non-limiting examples of the C₁-C₆₀ heteroaryl group include a pyridinylgroup, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, atriazinyl group, a quinolinyl group, and an isoquinolinyl group. Whenthe C₁-C₆₀ heteroaryl group and the C₁-C₆₀ heteroarylene group eachinclude two or more rings, the rings may be fused to each other.

The term “C₆-C₆₀ aryloxy group” as used herein refers to —OA₁₀₂ (whereinA₁₀₂ is the C₆-C₆₀ aryl group), and a C₆-C₆₀ arylthio group used hereinindicates —SA₁₀₃ (wherein A₁₀₃ is the C₆-C₆₀ aryl group).

The term “monovalent non-aromatic condensed polycyclic group” as usedherein refers to a monovalent group (for example, having 8 to 60 carbonatoms) that has two or more rings condensed with each other, only carbonatoms as a ring-forming atom, and non-aromaticity in the entiremolecular structure. A detailed example of the monovalent non-aromaticcondensed polycyclic group is a fluorenyl group. The term “divalentnon-aromatic condensed polycyclic group,” used herein, refers to adivalent group having the same structure as the monovalent non-aromaticcondensed polycyclic group.

The term “monovalent non-aromatic condensed heteropolycyclic group” asused herein refers to a monovalent group (for example, having 1 to 60carbon atoms) that has two or more rings condensed to each other, has atleast one heteroatom selected from N, O, Si, P, and S, other than carbonatoms, as a ring-forming atom, and has non-aromaticity in the entiremolecular structure. An example of the monovalent non-aromatic condensedheteropolycyclic group is a carbazolyl group. The term “divalentnon-aromatic condensed heteropolycyclic group,” used herein, refers to adivalent group having the same structure as the monovalent non-aromaticcondensed heteropolycyclic group.

The term “C₅-C₆₀ carbocyclic group” as used herein refers to amonocyclic or polycyclic group having 5 to 60 carbon atoms in which aring-forming atom is a carbon atom only. The C₅-C₆₀ carbocyclic groupmay be an aromatic carbocyclic group or a non-aromatic carbocyclicgroup. The C₅-C₆₀ carbocyclic group may be a ring, such as a benzene, amonovalent group, such as a phenyl group, or a divalent group, such as aphenylene group. In various embodiments, depending on the number ofsubstituents connected to the C₅-C₆₀ carbocyclic group, the C₅-C₆₀carbocyclic group may be a trivalent group or a quadrivalent group.

The term “C₁-C₆₀ heterocyclic group” as used herein refers to a grouphaving the same structure as the C₁-C₆₀ carbocyclic group, except thatas a ring-forming atom, at least one heteroatom selected from N, O, Si,P, and S is used in addition to carbon (the number of carbon atoms maybe in a range of 1 to 60).

At least one of substituents of the substituted C₅-C₆₀ carbocyclicgroup, substituted C₁-C₆₀ heterocyclic group, substituted C₃-C₁₀cycloalkylene group, substituted C₁-C₁₀ heterocycloalkylene group,substituted C₃-C₁₀ cycloalkenylene group, substituted C₁-C₁₀heterocycloalkenylene group, substituted C₆-C₆₀ arylene group,substituted C₁-C₆₀ heteroarylene group, a substituted divalentnon-aromatic condensed polycyclic group, a substituted divalentnon-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀ alkylgroup, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀ alkynylgroup, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkylgroup, substituted C₁-C₁₀ heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group, andsubstituted monovalent non-aromatic condensed heteropolycyclic group maybe selected from:

deuterium(-D), —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, anda C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group,and a C₁-C₆₀ alkoxy group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amidino group, a hydrazino group, a hydrazono group, aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁),—S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂),

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃),—N(Q₂₁)(Q₂₂), —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and—P(═O)(Q₂₁)(Q₂₂); and

—Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),—S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),

wherein Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently beselected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, acyano group, a nitro group, an amidino group, a hydrazino group, ahydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, aC₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, amonovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.

The term “Ph”, as used herein, may refer to a phenyl group; the term“Me”, as used herein, may refer to a methyl group; the term “Et”, asused herein, may refer to an ethyl group; the terms “ter-Bu” or “But”,as used herein, may refer to a tert-butyl group; and the term “OMe” asused herein may refer to a methoxy group.

The term “biphenyl group” as used therein refers to “a phenyl groupsubstituted with a phenyl group.” In other words, a “biphenyl group” isa substituted phenyl group having a C₆-C₆₀ aryl group as a substituent.

The term “terphenyl group” as used herein refers to “a phenyl groupsubstituted with a biphenyl group.” In other words, a “terphenyl group”is a substituted phenyl group having a C₆-C₆₀ aryl group substitutedwith a C₆-C₆₀ aryl group as a substituent

* and *′ used herein, unless defined otherwise, each refer to a bindingsite to a neighboring atom in a corresponding formula.

Hereinafter, a compound according to embodiments and an organiclight-emitting device according to embodiments will be described indetail with reference to Examples.

EXAMPLE

Example 1 (Red Phosphorescent Light)

As a substrate and an anode, a glass substrate including Corning 150/cm²(120 nm) ITO was cut to a size of 50 mm×50 mm×0.5 mm, and then,sonicated using acetone, isopropyl alcohol, and pure water, each for 15minutes, followed by exposure to radiation of ultraviolet rays for 30minutes and then to ozone. The resultant structure was mounted on avacuum deposition device.

m-MTDATA was vacuum-deposited on the ITO anode to form a hole injectionlayer having a thickness of 70 nm, Compound HT3 was vacuum-deposited onthe hole injection layer to form a hole transport layer having athickness of 70 nm.

Compound 2-3 was vacuum-deposited on the hole transport layer to form anemission auxiliary layer having a thickness of 10 nm.

Compound 1-21 (host) and Compound PD11 (dopant) (dopant content of 2 wt%) were co-deposited on the emission auxiliary layer to form an emissionlayer having a thickness of 30 nm.

Alq₃ was vacuum-deposited on the emission layer to form an electrontransport layer having a thickness of 30 nm, and then, LiF was depositedon the electron transport layer to form an electron injection layerhaving a thickness of 1 nm, and then, Al was vacuum-deposited thereon toform a second electrode (cathode) having a thickness of 200 nm, therebycompleting the manufacture of an organic light-emitting device.

Examples 2 to 5 and Comparative Examples 1 to 4 (Red PhosphorescentLight)

Organic light-emitting devices were manufactured in the same manner asin Example 1, except that such materials as shown in Table 1 were usedas a material for forming an emission auxiliary layer or a material fora host in an emission layer host.

Evaluation Example (Red Phosphorescent Light)

The driving voltage (V) and efficiency (cd/A) of the organiclight-emitting devices of Examples 1 to 5 and Comparative Examples 1 to4 were measured at 5 mA/cm² by using Keithley MU 236 and a luminancemeter PR650, and evaluation results are shown in Table 1.

TABLE 1 Driving Emission voltage Efficiency auxiliary layer Emissionlayer (V) (cd/A) Example 1 Compound 2-3 Compound 1-21 5.4 50.1 Example 2Compound 2-3 Compound 1-8 5.5 48.5 Example 3 Compound 2-3 Compound 1-145.3 49.3 Example 4 Compound 2-14 Compound 1-21 5.6 49.8 Example 5Compound 2-14 Compound 1-8 5.5 49.2 Comparative — Compound 1-21 5.8 22.7Example 1 Comparative Compound 2-3 CBP 5.7 22.3 Example 2 Comparative —CBP 6.2 21.6 Example 3 Comparative NPB Compound A-1 5.8 48.3 Example 4

Data shown in Table 1 shows that the organic light-emitting devices ofExamples 1 to 5 have a lower driving voltage and a higher efficiencythan the organic light-emitting devices of Comparative Examples 1 to 4.

Organic light-emitting devices according to embodiments of the presentdisclosure may have low driving voltage and high efficiency.

What is claimed is:
 1. An organic light-emitting device comprising: afirst electrode; a second electrode facing the first electrode; anemission layer between the first electrode and the second electrode; anda hole transport region between the first electrode and the emissionlayer, wherein the emission layer includes a first compound representedby Formula 1, the hole transport region includes a second compoundrepresented by Formula 2:

wherein, in Formulae 1, 1-1, and 2, rings A₁, A₄, and A₁₁ are eachindependently selected from a C₅-C₆₀ carbocyclic group and a C₁-C₃₀heterocyclic group, ring A₂ is selected from a C₁₀-Coo carbocyclic groupand a C₁-C₃₀ heterocyclic group, ring A₃ is selected from a grouprepresented by Formula 1-1, X₁ is selected from N andC-[(L₁)_(a1)-(R₁)_(b1)], X₂ is selected from N andC-[(L₂)_(a2)-(R₂)_(b2)], X₃ is selected from N andC-[(L₃)_(a3)-(R₃)_(b3)], wherein at least one selected from X₁ to X₃ isN, X₁₁ is selected from N-[(L₁₁)_(a11)-(R₁₁)_(b11)], O, S, Se,C(R₁₂)(R₁₃), and Si(R₁₂)(R₁₃), X₃₁ is selected fromN-[(L₃₁)_(a31)-(R₃₁)_(b31)], O, S, Se, C(R₃₂)(R₃₃), and Si(R₃₂)(R₃₃),each of L₁ to L₆, L₁₁, L₂₁ to L₂₃, L₃₁, L₃₂, L₄₁, L₄₂, and L₅₁ isindependently selected from a substituted or unsubstituted C₃-C₁₀cycloalkylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenylene group, a substituted or unsubstituted C₆-C₆₀arylene group, a substituted or unsubstituted C₁-C₆₀ heteroarylenegroup, a substituted or unsubstituted divalent non-aromatic condensedpolycyclic group, and a substituted or unsubstituted divalentnon-aromatic condensed heteropolycyclic group, each of a1 to a6, a11,a21 to a23, a31, a32, a41, a42, and a51 is independently an integerselected from 0 to 5, each of R₁ to R₅, R₁₂, R₁₃, R₂₁ to R₂₃, R₃₂ toR₃₅, R₅₁, and R₅₂ is independently selected from hydrogen, deuterium,—F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, anamidino group, a hydrazino group, a hydrazono group, a substituted orunsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, asubstituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted orunsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstitutedC₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedmonovalent non-aromatic condensed polycyclic group, a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₁)(Q₂)(Q₃), —N(Q₁)(Q₂), —B(Q₁)(Q₂), —C(═O)(Q₁), —S(═O)₂(Q₁), and—P(═O)(Q₁)(Q₂), R₁ and R₄ are optionally linked to form a saturated orunsaturated ring, R₂ and R₄ are optionally linked to form a saturated orunsaturated ring, R₃ and R₅ are optionally linked to form a saturated orunsaturated ring, R₁ and R₅ are optionally linked to form a saturated orunsaturated ring, R₁₁, R₃₁, R₄₁, and R₄₂ are each independently selectedfrom a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, and asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, each of b1 to b5, b21 to b23, b34, b35, b51, andb52 is independently an integer selected from 0 to 5, each of b11, b31,b41, and b42 is independently an integer selected from 1 to 5, each ofn1 to n3 and n12 is independently an integer selected from 0 to 4, n11is an integer selected from 2 to 4, wherein at least one of substituentsof the substituted C₃-C₁₀ cycloalkylene group, substituted C₁-C₁₀heterocycloalkylene group, substituted C₃-C₁₀ cycloalkenylene group,substituted C₁-C₁₀ heterocycloalkenylene group, substituted C₆-C₆₀arylene group, substituted C₁-C₆₀ heteroarylene group, a substituteddivalent non-aromatic condensed polycyclic group, a substituted divalentnon-aromatic condensed heteropolycyclic group, substituted C₁-C₆₀ alkylgroup, substituted C₂-C₆₀ alkenyl group, substituted C₂-C₆₀ alkynylgroup, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkylgroup, substituted C₁-C₁₀ heterocycloalkyl group, substituted C₃-C₁₀cycloalkenyl group, substituted C₁-C₁₀ heterocycloalkenyl group,substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group,substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group,substituted monovalent non-aromatic condensed polycyclic group andsubstituted monovalent non-aromatic condensed heteropolycyclic group isselected from: deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, and a C₁-C₆₀ alkoxy group; a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, —Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁₁)(Q₁₂),—B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁), —S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂), a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, a biphenyl group, and aterphenyl group; a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, and a monovalent non-aromatic condensed heteropolycyclic group,each substituted with at least one selected from deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group,—Si(Q₂₁)(Q₂₂)(Q₂₃), —N(Q₂₁)(Q₂₂), —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁),—S(═O)₂(Q₂₁), and —P(═O)(Q₂₁)(Q₂₂); and —Si(Q₃₁)(Q₃₂)(Q₃₃),—N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and—P(═O)(Q₃₁)(Q₃₂), wherein Q₁ to Q₃, Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ toQ₃₃ are each independently selected from hydrogen, deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, aC₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryl group substituted with a C₁-C₆₀ alkyl group, aC₆-C₆₀ aryl group substituted with a C₆-C₆₀ aryl group, a terphenylgroup, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryl group substitutedwith a C₁-C₆₀ alkyl group, a C₁-C₆₀ heteroaryl group substituted with aC₆-C₆₀ aryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group.
 2. Theorganic light-emitting device of claim 1, wherein each of rings A₁, A₄,and A₁₁ in Formulae 1 and 2 is independently selected from a benzenegroup, a naphthalene group, an anthracene group, a phenanthrene group, apyrene group, a chrysene group, a triphenylene group, an indene group, afluorene group, a benzofluorene group, a spiro-bifluorene group, apyridine group, a pyrazine group, a pyrimidine group, a pyridazinegroup, a pyrrole group, an imidazole group, a quinoline group, anisoquinoline group, a quinoxaline group, a quinazoline group, a triazinegroup, an indenopyrazine group, an indenopyridine group, aphenanthroline group, and a phenanthridine group.
 3. The organiclight-emitting device of claim 1, wherein ring A₂ in Formula 1 isselected from a naphthalene group, a heptalene group, a phenalene group,a phenanthrene group, an anthracene group, a triphenylene group, apyrene group, a chrysene group, naphthacene group, a picene group, aperylene group, a pentaphene group, a fluorene group, a benzofluorenegroup, a spiro-bifluorene group, a pyridine group, a pyrazine group, apyrimidine group, a pyridazine group, a pyrrole group, an imidazolegroup, a quinoline group, an isoquinoline group, a quinoxaline group, aquinazoline group, a triazine group, an indenopyrazine group, anindenopyridine group, a phenanthroline group, and a phenanthridinegroup.
 4. The organic light-emitting device of claim 1, wherein inFormula 1, i) X₁ is N, X₂ is C-[(L₂)_(a2)-(R₂)_(b2)], and X₃ isC-[(L₃)_(a3)-(R₃)_(b3)]; ii) X₁ is C-[(L₁)_(a1)-(R₁)_(b1)], X₂ isC-[(L₂)_(a2)-(R₂)_(b2)], and X₃ is N; iii) X₁ isC-[(L₁)_(a1)-(R₁)_(b1)], X₂ is N, and X₃ is C-[(L₃)_(a3)-(R₃)_(b3)], oriv) X₁ is C-[(L₁)_(a1)-(R₁)_(b1)], X₂ is N, and X₃ is N.
 5. The organiclight-emitting device of claim 1, wherein X₁₁ in Formula 1-1 is O or S.6. The organic light-emitting device of claim 1, wherein X₃₁ in Formula2 is selected from N-[(L₃₁)_(a31)-(R₃₁)_(b31)], O, S, and C(R₃₂)(R₃₃).7. The organic light-emitting device of claim 1, wherein L₁ to L₆, L₁₁,and L₂₁ to L₂₃ in Formulae 1 and 1-1 are each independently selectedfrom: a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, an indacenylene group, anacenaphthylene group, a fluorenylene group, a spiro-bifluorenylenegroup, spiro-benzofluorene-fluorenylene group, a benzofluorenylenegroup, a dibenzofluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a perylenylene group, a pentaphenylene group, a pyrrolylenegroup, a thiophenylene group, a furanylene group, a silolylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an indolylene group, an isoindolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, a benzofuranylene group,a benzothiophenylene group, a benzosilolylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a dibenzosilolylene group, acarbazolylene group, a benzocarbazolylene group, a dibenzocarbazolylenegroup, a thiadiazolylene group, an imidazopyridinylene group, animidazopyrimidinylene group, an oxazolopyridinylene group, athiazolopyridinylene group, a benzonaphthyridinylene group, anazafluorenylene group, an azaspiro-bifluorenylene group, anazacarbazolylene group, an azadibenzofuranylene group, anazadibenzothiophenylene group, and an azadibenzosilolylene group; and aphenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, an indacenylene group, anacenaphthylene group, a fluorenylene group, a spiro-bifluorenylenegroup, spiro-benzofluorene-fluorenylene group, a benzofluorenylenegroup, a dibenzofluorenylene group, a phenalenylene group, aphenanthrenylene group, an anthracenylene group, a fluoranthenylenegroup, a triphenylenylene group, a pyrenylene group, a chrysenylenegroup, a perylenylene group, a pentaphenylene group, a pyrrolylenegroup, a thiophenylene group, a furanylene group, a silolylene group, animidazolylene group, a pyrazolylene group, a thiazolylene group, anisothiazolylene group, an oxazolylene group, an isoxazolylene group, apyridinylene group, a pyrazinylene group, a pyrimidinylene group, apyridazinylene group, an indolylene group, an isoindolylene group, anindazolylene group, a purinylene group, a quinolinylene group, anisoquinolinylene group, a benzoquinolinylene group, a phthalazinylenegroup, a naphthyridinylene group, a quinoxalinylene group, aquinazolinylene group, a cinnolinylene group, a phenanthridinylenegroup, an acridinylene group, a phenanthrolinylene group, aphenazinylene group, a benzimidazolylene group, a benzofuranylene group,a benzothiophenylene group, a benzosilolylene group, anisobenzothiazolylene group, a benzoxazolylene group, anisobenzoxazolylene group, a triazolylene group, a tetrazolylene group,an oxadiazolylene group, a triazinylene group, a dibenzofuranylenegroup, a dibenzothiophenylene group, a dibenzosilolylene group, acarbazolylene group, a benzocarbazolylene group, a dibenzocarbazolylenegroup, a thiadiazolylene group, an imidazopyridinylene group, animidazopyrimidinylene group, an oxazolopyridinylene group, athiazolopyridinylene group, a benzonaphthyridinylene group, anazafluorenylene group, an azaspiro-bifluorenylene group, anazacarbazolylene group, an azadibenzofuranylene group, anazadibenzothiophenylene group, and an azadibenzosilolylene group, L₃₁,L₃₂, L₄₁, L₄₂, and L₅₁ in Formula 2 are each independently selectedfrom: a phenylene group, a pentalenylene group, an indenylene group, anaphthylene group, an azulenylene group, an indacenylene group, anacenaphthylene group, a fluorenylene group, a benzofluorenylene group, adibenzofluorenylene group, a phenalenylene group, a phenanthrenylenegroup, an anthracenylene group, a fluoranthenylene group, atriphenylenylene group, a pyrenylene group, a chrysenylene group, aperylenylene group, a pentaphenylene group, a pyrrolylene group, athiophenylene group, a furanylene group, a silolylene group, apyridinylene group, an indolylene group, an isoindolylene group, apurinylene group, a benzofuranylene group, a benzothiophenylene group, abenzosilolylene group, a dibenzofuranylene group, a dibenzothiophenylenegroup, and dibenzosilolylene group; and a phenylene group, apentalenylene group, an indenylene group, a naphthylene group, anazulenylene group, an indacenylene group, an acenaphthylene group, afluorenylene group, a benzofluorenylene group, a dibenzofluorenylenegroup, a phenalenylene group, a phenanthrenylene group, ananthracenylene group, a fluoranthenylene group, a triphenylenylenegroup, a pyrenylene group, a chrysenylene group, a perylenylene group, apentaphenylene group, a pyrrolylene group, a thiophenylene group, afuranylene group, a silolylene group, a pyridinylene group, anindolylene group, an isoindolylene group, a purinylene group, abenzofuranylene group, a benzothiophenylene group, a benzosilolylenegroup, a dibenzofuranylene group, a dibenzothiophenylene group, anddibenzosilolylene group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group,a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenylgroup, a pentaphenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, a silolyl group, a pyridinyl group, an indolyl group, anisoindolyl group, a purinyl group, a benzofuranyl group, abenzothiophenyl group, a benzosilolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃),—N(Q₃₁)(Q₃₂), and —B(Q₃₁)(Q₃₂), wherein Q₃₁ to Q₃₃ are eachindependently selected from: a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxygroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, aquinolinyl group, an isoquinolinyl group, a quinoxalinyl group, and aquinazolinyl group; and a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a pyridinyl group, a pyrimidinyl group, apyrazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, and a quinazolinyl group, each substituted with atleast one selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, anda phenyl group.
 8. The organic light-emitting device of claim 1, whereinR₁ to R₅, R₁₂, R₁₃, and R₂₁ to R₂₃ in Formulae 1 and 1-1 are eachindependently selected from: hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, and a C₁-C₂₀alkoxy group; a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, and a hydrazono group; a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group,a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, spiro-benzofluorene-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenylgroup, a pentaphenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, a silolyl group, an imidazolyl group, a pyrazolyl group,a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an indolyl group, an isoindolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinylgroup, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzimidazolyl group, a benzofuranyl group, abenzothiophenyl group, a benzosilolyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group,a carbazolyl group, a benzocarbazolyl group, a dibenzocarbazolyl group,a thiadiazolyl group, an imidazopyridinyl group, an imidazopyrimidinylgroup, an oxazolopyridinyl group, a thiazolopyridinyl group, abenzonaphthyridinyl group, an azafluorenyl group, anazaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranylgroup, an azadibenzothiophenyl group, and an azadibenzosilolyl group;and a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-bifluorenyl group,spiro-benzofluorene-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anindolyl group, an isoindolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azaspiro-bifluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, and an azadibenzosilolyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, a terphenyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and R₁₁in Formula 1-1 is selected from: a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group,a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenylgroup, spiro-benzofluorene-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anindolyl group, an isoindolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azaspiro-bifluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, and an azadibenzosilolyl group; and a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group,a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, aspiro-bifluorenyl group, spiro-benzofluorene-fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenylgroup, a pentaphenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, a silolyl group, an imidazolyl group, a pyrazolyl group,a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an indolyl group, an isoindolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinylgroup, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzimidazolyl group, a benzofuranyl group, abenzothiophenyl group, a benzosilolyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group,a carbazolyl group, a benzocarbazolyl group, a dibenzocarbazolyl group,a thiadiazolyl group, an imidazopyridinyl group, an imidazopyrimidinylgroup, an oxazolopyridinyl group, a thiazolopyridinyl group, abenzonaphthyridinyl group, an azafluorenyl group, anazaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranylgroup, an azadibenzothiophenyl group, and an azadibenzosilolyl group,each substituted with at least one selected from deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, amonovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, a terphenyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), whereinQ₃₁ to Q₃₃ are each independently selected from: a C₁-C₁₀ alkyl group, aC₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a pyridinyl group, a pyrimidinyl group, apyrazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, and a quinazolinyl group; and a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a pyridinyl group,a pyrimidinyl group, a pyrazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, and a quinazolinyl group,each substituted with at least one selected from a C₁-C₁₀ alkyl group, aC₁-C₁₀ alkoxy group, and a phenyl group.
 9. The organic light-emittingdevice of claim 1, wherein each of R₃₁, R₄₁, and R₄₂ in Formula 2 isindependently selected from: a cyclopentyl group, a cyclohexyl group, acycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenylgroup, a biphenyl group, a terphenyl group, a pentalenyl group, anindenyl group, a naphthyl group, an azulenyl group, an indacenyl group,an acenaphthyl group, a fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, a pyridinyl group, an indolyl group, an isoindolyl group, apurinyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, a dibenzofuranyl group, a dibenzothiophenyl group,and a dibenzosilolyl group; and a cyclopentyl group, a cyclohexyl group,a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, aphenyl group, a biphenyl group, a terphenyl group, a pentalenyl group,an indenyl group, a naphthyl group, an azulenyl group, an indacenylgroup, an acenaphthyl group, a fluorenyl group, a benzofluorenyl group,a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, a pyridinyl group, an indolyl group, an isoindolyl group, apurinyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, a dibenzofuranyl group, a dibenzothiophenyl group,and a dibenzosilolyl group, each substituted with at least one selectedfrom deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, anitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group,a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenylgroup, a pentaphenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, a silolyl group, a pyridinyl group, an indolyl group, anisoindolyl group, a purinyl group, a benzofuranyl group, abenzothiophenyl group, a benzosilolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃),—N(Q₃₁)(Q₃₂), and —B(Q₃₁)(Q₃₂), and each of R₃₂ to R₃₅, R₅₁, and R₅₂ inFormula 2 is independently selected from: hydrogen, deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, and aC₁-C₂₀ alkoxy group; a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group,each substituted with at least one selected from deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, and a hydrazono group; a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group,a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, an indacenyl group, an acenaphthyl group, a fluorenyl group, abenzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, aphenanthrenyl group, an anthracenyl group, a fluoranthenyl group, atriphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenylgroup, a pentaphenyl group, a pyrrolyl group, a thiophenyl group, afuranyl group, a silolyl group, an imidazolyl group, a pyrazolyl group,a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an indolyl group, an isoindolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinylgroup, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, aphenanthridinyl group, an acridinyl group, a phenanthrolinyl group, aphenazinyl group, a benzimidazolyl group, a benzofuranyl group, abenzothiophenyl group, a benzosilolyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group,a thiadiazolyl group, an imidazopyridinyl group, an imidazopyrimidinylgroup, an oxazolopyridinyl group, a thiazolopyridinyl group, abenzonaphthyridinyl group, an azafluorenyl group, an azadibenzofuranylgroup, an azadibenzothiophenyl group, and an azadibenzosilolyl group;and a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenylgroup, a terphenyl group, a pentalenyl group, an indenyl group, anaphthyl group, an azulenyl group, an indacenyl group, an acenaphthylgroup, a fluorenyl group, a spiro-bifluorenyl group,spiro-benzofluorene-fluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenylgroup, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolylgroup, an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anindolyl group, an isoindolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group, anoxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinylgroup, an azafluorenyl group, an azaspiro-bifluorenyl group, anazacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenylgroup, and an azadibenzosilolyl group, each substituted with at leastone selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amidino group, a hydrazino group, a hydrazonogroup, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,a monovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, a terphenyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),—B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂); whereinQ₃₁ to Q₃₃ is each independently selected from: a C₁-C₁₀ alkyl group, aC₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a pyridinyl group, a pyrimidinyl group, apyrazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, and a quinazolinyl group; and a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a pyridinyl group,a pyrimidinyl group, a pyrazinyl group, a quinolinyl group, anisoquinolinyl group, a quinoxalinyl group, and a quinazolinyl group,each substituted with at least one selected from a C₁-C₁₀ alkyl group, aC₁-C₁₀ alkoxy group, and a phenyl group.
 10. The organic light-emittingdevice of claim 1, wherein each of R₁ to R₅, R₁₂, R₁₃, and R₂₁ to R₂₃ inFormula 1 is independently selected from hydrogen, deuterium, —F, —Cl,—Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidinogroup, a hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, aC₁-C₂₀ alkoxy group, a group represented by one of Formulae 5-1 to 5-45and 6-1 to 6-124, —Si(Q₁)(Q₂)(Q₃), —S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂), R₁₁in Formula 1-1 is selected from a group represented by one of Formulae5-1 to 5-45 and 6-1 to 6-124, R₃₁, R₄₁, and R₄₂ in Formula 2 are eachindependently selected from a group represented by one of Formulae 5-1to 5-45, and R₃₂ to R₃₅, R₅₁, and R₅₂ in Formula 2 are eachindependently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀alkoxy group, a group represented by one of Formulae 5-1 to 5-45,—Si(Q₁)(Q₂)(Q₃), —S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂):

wherein, in Formulae 5-1 to 5-45 and 6-1 to 6-124, each of Y₃₁ and Y₃₂is independently selected from O, S, C(Z₃₃)(Z₃₄), N(Z₃₅), orSi(Z₃₆)(Z₃₇), Y₄₁ is N or C(Z₄₁), Y₄₂ is N or C(Z₄₂), Y₄₃ is N orC(Z₄₃), Y₄₄ is N or C(Z₄₄), Y₅₁ is N or C(Z₅₁), Y₅₂ is N or C(Z₅₂), Y₅₃is N or C(Z₅₃), Y₅₄ is N or C(Z₅₄), at least one selected from Y₄₁ toY₄₃ and Y₅₁ to Y₅₄ in Formulae 5-118 to 5-121 is N, at least oneselected from Y₄₁ to Y₄₄ and Y₅₁ to Y₅₄ in Formulae 5-122 is N, each ofZ₃₁ to Z₃₈, Z₄₁ to Z₄₄, and Z₅₁ to Z₅₄ is independently selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cyclopentenyl group, acyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group,a pentalenyl group, an indenyl group, a naphthyl group, an azulenylgroup, a heptalenyl group, an indacenyl group, an acenaphthyl group, afluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, adibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, ananthracenyl group, a fluoranthenyl group, a triphenylenyl group, apyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group,a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenylgroup, a rubicenyl group, a coronenyl group, an ovalenyl group, apyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, animidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolylgroup, an oxazolyl group, an isoxazolyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolylgroup, an isoindolyl group, an indazolyl group, a purinyl group, aquinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aphthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, aquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, anacridinyl group, a phenanthrolinyl group, a phenazinyl group, abenzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, abenzosilolyl group, an isobenzothiazolyl group, a benzoxazolyl group, anisobenzoxazolyl group, a triazolyl group, a tetrazolyl group, anoxadiazolyl group, a triazinyl group, a dibenzofuranyl group, adibenzothiophenyl group, a dibenzosilolyl group, a carbazolyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group,an imidazopyridinyl group, an imidazopyrimidinyl group,benzonaphthyridinyl group, an azafluorenyl group, anazaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranylgroup, an azadibenzothiophenyl group, an azadibenzosilolyl group, and—Si(Q₃₁)(Q₃₂)(Q₃₃), wherein each of Q₁ to Q₃ and Q₃₁ to Q₃₃ isindependently selected from: a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxygroup, a phenyl group, a biphenyl group, a terphenyl group, a naphthylgroup, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, aquinolinyl group, an isoquinolinyl group, a quinoxalinyl group, and aquinazolinyl group; and a phenyl group, a biphenyl group, a terphenylgroup, a naphthyl group, a pyridinyl group, a pyrimidinyl group, apyrazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, and a quinazolinyl group, each substituted with atleast one selected from a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, anda phenyl group, e2 is an integer selected from 0 to 2; e3 is an integerselected from 0 to 3, e4 is an integer selected from 0 to 4, e5 is aninteger selected from 0 to 5, e6 is an integer selected from 0 to 6, e7is an integer selected from 0 to 7, e9 is an integer selected from 0 to9, and * indicates a binding site to a neighboring atom.
 11. The organiclight-emitting device of claim 1, wherein the first compound isrepresented by one of Formulae 1A to 1L:

wherein, in Formulae 1A to 1L, rings A₁ and A₄, X₁ to X₃, X₁₁, L₁, a1,R₄, R₅, R₂₁ to R₂₃, and b21 to b23 are the same as described in claim 1.12. The organic light-emitting device of claim 1, wherein the secondcompound is represented by one of Formulae 2A to 2D:

wherein, in Formulae 2A to 2D, X₃₁, L₃₂, a32, R₃₄, R₃₅, b34, and b35 arethe same as described in claim 1, L_(41a) and L_(41b) are the same asdescribed in connection with L₄₁ in claim 1, L_(42a) and L_(42b) are thesame as described in connection with L₄₂ in claim 1, aa41 and ab41 arethe same as described in connection with a41 in claim 1, aa42 and ab42are the same as described in connection with a42 in claim 1, R_(41a) andR_(41b) are the same as described in connection with R₄₁ in claim 1,R_(42a) and R_(42b) are the same as described in connection with R₄₂ inclaim 1, ba41 and bb41 are the same as described in connection with b41in claim 1, and ba42 and bb42 are the same as described in connectionwith b42 in claim
 1. 13. The organic light-emitting device of claim 1,wherein the emission layer comprises the first compound as a first host,and the emission layer further comprises a second host that is differentfrom the first host.
 14. The organic light-emitting device of claim 1,wherein the emission layer further comprises a phosphorescent dopant,wherein the phosphorescent dopant comprises an organometallic compoundcomprising iridium (Ir), platinum (Pt), palladium (Pd), osmium (Os),titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium(Tb), rhodium (Rh), or thulium (Tm).
 15. The organic light-emittingdevice of claim 14, wherein the phosphorescent dopant comprises anorganometallic compound represented by Formula 401:

wherein, in Formulae 401 and 402, M is selected from iridium (Ir),platinum (Pt), palladium (Pd), osmium (Os), titanium (Ti), zirconium(Zr), hafnium (Hf), europium (Eu), terbium (Tb), rhodium (Rh), andthulium (Tm), L₄₀₁ is a ligand represented by Formula 402, and xc1 is 1,2, or 3, wherein when xc1 is two or more, two or more L₄₀₁(s) areidentical to or different from each other, L₄₀₂ is an organic ligand,and xc2 is an integer selected from 0 to 4, wherein when xc2 is two ormore, two or more L₄₀₂(s) are identical to or different from each other,X₄₀₁ to X₄₀₄ are each independently nitrogen or carbon, X₄₀₁ and X₄₀₃are linked via a single bond or a double bond, and X₄₀₂ and X₄₀₄ arelinked via a single bond or a double bond, A₄₀₁ and A₄₀₂ are eachindependently a C₅-C₆₀ carbocyclic group or a C₁-C₆₀ heterocyclic group,X₄₀₅ is a single bond, *—O—*′, *—S—*I, *—C(═O)—*′, *—N(Q₄₁₁)-*′,*—C(Q₄₁₁)(Q₄₁₂)-*′, *—C(Q₄₁₁)═C(Q₄₁₂)-*′, *—C(Q₄₁₁)=*′, or *═C(Q₄₁₁)=*′,wherein Q₄₁₁ and Q₄₁₂ are each independently hydrogen, deuterium, aC₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenylgroup, a terphenyl group, or a naphthyl group, X₄₀₆ is a single bond, O,or S, R₄₀₁ and R₄₀₂ are each independently selected from hydrogen,deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, asubstituted or unsubstituted C₁-C₂₀ alkyl group, a substituted orunsubstituted C₁-C₂₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkylgroup, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, asubstituted or unsubstituted C₆-C₆₀ aryl group, a substituted orunsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstitutedC₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroarylgroup, a substituted or unsubstituted monovalent non-aromatic condensedpolycyclic group and a substituted or unsubstituted monovalentnon-aromatic condensed heteropolycyclic group —Si(Q₄₀₁)(Q₄₀₂)(Q₄₀₃),—N(Q₄₀₁)(Q₄₀₂), —B(Q₄₀₁)(Q₄₀₂), —C(═O)(Q₄₀₁), —S(═O)₂(Q₄₀₁), and—P(═O)(Q₄₀₁)(Q₄₀₂), wherein Q₄₀₁ to Q₄₀₃ are each independently selectedfrom a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkoxy group, a C₆-C₂₀ aryl group,and a C₁-C₂₀ heteroaryl group, xc11 and xc12 are each independently aninteger selected from 0 to 10, and * and *′ in Formula 402 each indicatea binding site to M in Formula
 401. 16. The organic light-emittingdevice of claim 1, wherein the hole transport region comprises a holeinjection layer, a hole transport layer, and an emission auxiliarylayer, and the emission auxiliary layer comprises the second compound.17. The organic light-emitting device of claim 1, wherein the emissionauxiliary layer directly contacts the emission layer.
 18. The organiclight-emitting device of claim 1, wherein the hole transport regioncomprises a p-dopant, and a lowest unoccupied molecular orbital (LUMO)of the p-dopant is −3.5 eV or lower.
 19. The organic light-emittingdevice of claim 18, wherein the p-dopant comprises a cyanogroup-containing compound.
 20. The organic light-emitting device ofclaim 1, wherein the emission layer comprises a first-color-lightemission layer, the organic light-emitting device further comprises i)at least one second-color-light emission layer, or ii) at least onesecond-color-light emission layer and at least one third-color-lightemission layer, between the first electrode and the second electrode, amaximum emission wavelength of the first-color-light, a maximum emissionwavelength of the second-color-light, and a maximum emission wavelengthof the third-color-light are identical to or different from each other,and either the first-color-light and the second-color-light are emittedas mixed light, or the first-color-light, the second-color-light, andthe third-color-light are emitted as mixed light.